Stratigraphic sections of the Phosphoria formation in Idaho, 1947-48, Part I

McKelvey, Vincent Ellis, Davidson, D.F., O’Malley, F. W., Smith, L.E. · 1952 · Report

<p>The Permian Phosphoria formation of the western states contains one of the world's largest reserves of phosphate. Although previous investigations (see…

Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.

(c9.00) Stratigraphic Sections of the Phosphoria Formation in Idaho, 1947-48, Part I , ,' Trace Elements ln'Vestigations Report 183 UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY

USGS - TEl Report 183 GEOLOGY - MINERALOGY Distribution (SeriesA), No. of copies American Cyanamid Company, Wj,chester .

o Atomic Energy Commission, Washington Battelle Memorial Institute, Columbus. ..

'Carbide and Carbon Chemicals Company, Y -12 Area Division of Raw Materials, Grants Division of Raw Materials, Denver Division of Raw Materials, Hot Springs. Division of Raw Materials, New York . Division of Raw Materials, Salt Lake City Division of Raw Materials, Richfield

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Division of Raw Materials, Washington* Dow Chemical Company, Pittsburg ·0

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Exploration Division, Grand Junction Operations Office9

Grand Junction Operations Office. Technical Information Service, Oak Ridge

Tennessee Valley Authority, Wilson Dam.

U. S. Geological Survey: Mineral Deposits Branch, ·Washington Geochemistry and Petrology Branch, 'Washington Geophysics Branch, Washington Alaskan Geology Branch. Washington Fuels Branch, Washington L. R. Pagep Denver.

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R. P. Fischer~ Grand Junction. A. E., Weissenborn, Spokane C. B. Hunt, Plant City R. W. Swanson, S'pokane. .. A. H. Koschmann, Denver. E. H. Bailey, San Francisco C. E. Dutton, Madison R. A. Laurence, Knoxville R. J. Roberts, Salt Lake City TEPCO. Washington: Resource Compilation Section Reports Processing Section (Xncl uding master) 0 0 · ·3

dlanged to OFFICIAL USE ONLY Geology - Mineralogy by atbority of f. 1- , M -o2 l"'Y' ++- 1 <(;19.u!hi_s document consists of 53 pages. of Oil nl3kmg change, and date-thereof) :>enes A U NKTE D S T A TES D E PAR T ME N T OF THE INTERIOR G EO LO G KC A L S U.RVE Y STRA TI G RAPH IC S ECTIONS O F THE PHOSPH ORIA FORMATION By Vo Eo McKelvey" Do F. Davi.dson 0 Fo Wa O'Malley, Lo E. Smith, F. C. Armstrong, and R. P 0 Sheldon without editorial and technical review for conformity wi1th official standards and nomenclature. It is not for public ill1lS_Qect_ion _or ggQ!~J:ion. De ember 1952 '*This report coru:ems wmk done on behalf of the Division of Raw Materials of the U. So Atomic Energy Commission

CO NT ENTS Introduction " o o o Acknowledgments

o " Field and laboratory procedures o ·o " Preparation of sections for description and sampling Measurement and description of strata

Collection of samples Treatment and analysis of samples linterpretau:ion of chemical data Classification and nomenclature of rocks of the Phosphoria formation Stratigraphy of the Phosphoria formation in southeastern Idaho 0 Stratigraphic sections 0 o o References 0 o o o o "" o o o o o o o Tables of su:ratigraphic sections . Diamond drill hole 8, Fort Hall mine Dliamon.d drill hole 9, Fort Hall mine Caldwell Canyon 0 ·o o o o ., Mabie Canyon 0 o o ·0 o o o Spectrographic analyses Conda o

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o a ' o ·a ·_Spectrographic analyses. Diamond drill hole 6. Slug Creek Valley 0 Diamond drill hole 3. Middle Sulphur Canyon Diamond drill hole 4. Middle Sulphur Canyon Diamond di'ill hole 5. South Fork of Johnson Creek North Dairy 0 Swan Lake Gulch 0 Deer Creek 0 I LLUSTRA TI ONS · 0

. Plate 10 Permian phosphate deposits of Kda~o showing localities samples · 0 . Figure 10 Phosphate deposits and sample localities of inset area on plate 1 20 Generalized typical section of Phosphoria formation in southeastern Idaho o o o o "' o o ·o · o o o o o o o o o o o o . o

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l , "t STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION IN IDAHO, 1947-48, PART I INTRODUCTION The Permian Phosphoria formation of the western states contains one of the world's largest reserves of phosphate. Although previous investigations (see especially Mansfield, 19 2 7), including reconnaissance geologic mapping and sampling, established the location of most of the important deposits and their quality at scattered localities, they were not sufficiently detailed to permit a comparison of the merits of individual deposits or an appraisal of the reserves of phosphate rock that might be available under present economic conditions. Because the growing importance of the western phosphate deposits requires a better, more detailed understanding of their distribution and quality, the Geological Survey began in 194 7 a comprehensive investigation, including (1) reconnaissance geologic mapping, mostly in Montana, of areas in which the Phosphoria formation could occur but where it had not previously been looked for or found; (2) geologic mapping, mostly in Montana, at a scale no smaller than 1:62, 500, of several areas known to contain the Phosphoria formation but not previously mapped except in reconnaissance fashion; (3) geologic and topographic mapping, at a scale of 1:12, 000, of some of the richest, thickest, and most accessible deposits; (4) measuring, describing, and sampling all beds of the phosphatic and shaly parts, and in some places the full thickness, of the Phosphoria formation and its stratigraphic equivalents at one or two localities per township over the entire field; (5) chemical and spectrographic analysis of the samples for phosphate, fluorine, minor metals, oil, and rock-forming constituents; and (6) petrologic and geochemical studies of the rocks and minerals of the formation. These studies are designed to define the regional and local geologic structures in which the phosphate beds lie, to provide a basis for the estimation of reserves of the inferred class over the entire region, and to determine the origin of the rocks and the elements contained ·in them. The data collected are not of the detail required to plan actual mining operations, but it is hoped they will guide industry in the selection of individual deposits worthy of further exploration. Most of the field work contemplated as a part of this investigation is now completed. Although the data will not be compiled or published in final form for some years to come, segments of the data, accompanied by little or no interpretation, will be published as preliminary maps or reports as they are assembled. The present report is the first of a series presenting in abbreviated form the descriptions and analyses of the beds measured and sampled at various localities in southeastern Idaho (pl. 1), Companion reports presenting segments of the data from Montana, Wyoming, and Utah (Swanson and others, 195l, ~:~.nd McKelvey and others, 1952a and 1952b) are being released at the same time as this report, and others are in preparation. .

A large number of people have taken part in this investigation. In addition to the authors, R. M. Campbell, R. A. Gulbrandsen, R. A. Hoppin, D. M. Larrabee, 0. A. Payne, R. S. Sears, R. A. Smart, R. G. Waring, and R. A. Weeks participated in the description of the strata and collection of the samples referred to in this report. D. B. Dimick, Jack George, W. S. Hunziker, J. E. Jones, H. A. Larsen, and T. K. Rigby assisted in the preparation of trenches and collection, crushing, and splitting of samples in the field. The diamond drilling described in this report was undertaken for the Geological Survey as a cooperative project by the U. S. Bureau of Mines. This drilling was under the supervision of A. E. Long ( 1949). The laboratory preparation of samples for chemical analysis was done under the direction of W. P. Huleatt ( 1950), who also designed a crushing and splitting apparatus for field use. The analyses for P2 0 5 and acid insoluble and most of those for Al20 3, Fe2o3, and loss on ignition were made for the Survey by tlie Bureau of Mines at the Northwest Electrodevelopment Laboratory, Albany, Oreg., under the direction of S. M. Shelton and M. L. Wright. The spectrographic analyses in the Bureau of Mines Laboratory were prepared by D. M. Mortimer. Analytical work by the Geochemistry and Petrology Branch of the Geological Survey has been done under the direction of J. C. Rabbitt by chemists I. Barlow, A. Caemmerer, J. Greene, N. Guttag, and E. H. Humphrey. Compilation of the data has been largely by R. P. Sheldon and F. D. Frieske under the supervision of R. W. Swanson. Organization of the tabular data has been largely by Anita Cozzetto. Acknowledgments Special thanks are due W. W. Rubey, J. S. Williams, and A. E. Weissenborn who have given much advice in planning and organizing the field program. The cost of both the field and laboratory investigations has been partly borne by the Division of Raw Materials of the Atomic Energy Commission. This support is gratefully acknowledged. It is a pleasure to acknowledge the fine cooperation extended to the field party by the local residents, property owners, and operating phosphate companies, who furnished information and services and gave access to property. A. J. Winters, Superintendent of the Montpelier schools; E. M. Norris, C. T. Russell, and L. E. Traeger of the Anaconda Copper Mining Company; D. L. King of the San Francisco Chemical Company; and G. A. McHugh and H. B. Fowler of the Simplot Fertilizer Company have been especially helpful in this connection.

r UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY PLATE 1 .· ~51 .· 12 9 4- 5 /.z 41 ~oi 1296 - 7 ,

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I 26 9 J 4 EXPLANATION Outcrop of Phosphoria formation, dotted where questionable Location and lot number of sample locality included in this report Location and lot number of sample locality to be included in later reports ,.13 13 --,...,--- 1308 " ' 131 5 ·, , ']1207 ---1 I 1202 INDEX MAP IDAHO 42° -

J 42° UTAH PERMIAN PHOSPHATE DEPOSITS OF IDAHO SHOWING LOCALITIES SAMPLED .l·s2asii:Esoss:lis;coe~~~li:0 2:E0~~~33co ::::!~o Miles 111° '32305

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EXPLANATION Outcrop of Phosphoria formation Location and lot number of sample locality included in this report ol262 Location and lot number of sample locality t() be included in later reports

( 10 Miles PG1310 INDEX MAP I I ·i r 011 (!) -i~ Figure 1. --Phosphate deposits and sample localities of inset area on plate 1

OFACI L ·SE Or~l Y FIELD AND LABORATORY PROCEDURES The field and laboratory procedures followed in these investigations and the definitions of the lithologic terms adopted throughout the work, particularly insofar as they bear upon the interpretation of the data presented, are described in some detail in this report but will be omitted or only summarized in subsequent ones . Preparation of Sections for Description and Sampling Natural exposures of the phosphatic shale member of the Phosphoria formation are rare. Most of the sections measured, therefore, have been exposed artificially, generally by bulldozer but in some places by hand-trenching. The trenches, which range from 5 to as much as 30 feet in depth and from 200 to 500 feet in length, have been located mostly on steep slopes containing a minimum of foreign talus and abundant fragments of phosphate rock and in areas where the regularity of outcrops of adjacent formations and the covered interval between them indicated little or no structural complication. Despite these precautions, part if not much of the phosphatic shale proved too deeply buried to expose at several localities; the rocks exposed at most localities are weathered and in some places physically distorted or displaced by creep; and at some localities parts of the section are repeated or omitted by faults not recognizable at the surface. For these reasons the thicknesses measured do not everywhere represent the true thickness of the rocks, and the samples collected and analyzed are not wholly representative of the rocks at depth. A few sections were obtained by diamond drilling undertaken by the Bureau of Mines in cooperation with the Geological Survey in an effort to develop a means of coring the Phosphoria formation. The engineering results of this experimental drilling have been described in another report (Long, 1949). Measurement and Description of Strata The full thickness, or such of it as could be exposed, of the phosphatic member of the Phosphoria formation has been described and sampled at each locality. In addition the entire formation has been described, and in some places sampled as well, at selected localities to provide information on other constituents besides the phosphate and to provide stratigraphic information for correlation purposes. Each lithologic unit greater than 0. 5 foot in thickness has been described and sampled separately (a few thinner units have been described and sampled as well), and units greater than 5 feet in thickness have been divided into two or more parts, except in nonphosphatic parts of the formation where some thicker units have not been subdivided. For identification purposes, each locality has been assigned a lot number, each bed described a bed number, and each bed sampled a sample number. Because many people have participated in the measurement and description of the beds, it has been necessary to standardize the terminology used in the work in order to achieve uniform results. This has been achieved mainly through the use of prepared forms or tables with spaces in which to record for each unit its bed number, sample number, field name, thickness, texture, grain size, hardness, thickness of bedding~, presence of fossils, mineralogy, reaction to hydrocnloric acid, color, jointing, and nature of contact with the underlying unit. In order that field descriptions could be augmented by laboratory petrographic studies, one or more chip samples have been collected from each unit. Only a brief abstract of this field description--bed and sample numbers, rock name, and bed thickness-- is presented here, but most of the remaining data will be presented later. Collection of Samples Channel or bench samples have been collected from each unit over the full thickness of the phosphatic member of the Phosphoria formation and, in a few places, over the entire formation. The minimum weight of the samples is 12 pounds, but the average weight of those collected from the sections described in this report is about 35 pounds. Treatment and Analysis of Samples All samples have been crushed to minus i-inch mesh and reduced to 10 pounds in a field laboratory established at Montpelier, Idaho, using a combination jaw crusher and Vezin-type splitter designed by W. P. Huleatt (1950). The crushed samples have been split into two parts at the Geological Survey samplepreparation laboratory in Denver--one stored with no further treatment and the other ground to minus 20mesh. From the latter, two 4-ounce splits have been cut and ground to minus 80-mesh for chemical analysis. Powders for spectrographic analysis also have been prepared in the Survey's Denver laboratory. All samples have been analyzed for P 20 5 and acid insoluble by methods essentially the same as those described by Hoffman and Lundell (1938). In addition all samples from a few localities have been analyzed for Al20 3, Fe 2o3, V 20 5, and loss on ignition, and semiquantitatively spectrographed for Al, Ba, B, Ca, Cr, Co, Cu, Fe, Pb, Mg, Mn, Mo, Ni, Si, Ag, Na, Sr, Ti, V, Zn, and Zr and, in a large percentage of the samples, for nearly 20 additional elements including Sb, As, Be, Bi, Cd, Cb, Ga, Ge, Au, In, Li, Hg, Pt, Ta, Sn, and W. Most samples representing a thickness of more than 3 feet and a P 2o5 content in excess of 30 percent or a thickness of more than 10 feet and a P 2 0 5 content in excess of 20 percent have been analyze for Al20 3, Fe203' and loss on ignition, and most of these same samples have been spectrographed for the constituents listed above. Some of these samples have also been analyzed for F or V 20 5. A small percentage of the analyses of the samples reported here are not yet available. They will be presented in later reports. INTERPRETATION OF CHEMICAL DATA Nearly all the phosphate is in carbonatefluorapatite, which has a composition of about 9Ca0. 3P 2 CaF 2. COl' H2 0. The percentage of P 20 5 multiplied by 2. 55, therefore, gives theapproxlmate percentage of the phosphate minera.A.. The percentage of tricalcium phosphate, 3Ca0. P 20 5, or bone phosphate of lime (B. P. L.) as it is calied in the phosphate industry, may be calculated by multiplying the percentage of P 2o5 by 2. 18. Acid-insoluble content may be determir.ed by a variety of procedures that yield widely different results. In the analyses reported here, the acid-insoluble content represents that portion of the rock not soluble in aqua regia and not ignitable or yolatile at about 1000° C. The acid-insoluble fraction consists principally of silica, but it generally also includes 10-30 percent of the total iron oxide, alumina, and titania and a generally negligible percentage of phosphate, magnesia, lime, and several minor metals such as zirconium. Mineralogically it may be taken as an approximate index of the total amount of detrital minerals in the rock; the fact that some of the detritals may have been partially dissolved by the acid treatment is counterbalanced by the fact that many rocks contain some secondary chert. Attention is called to

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the fact that the acid-insoluble residue determined in this fashion includes little if any carbonaceous matter. That portion of the rock not in carbonatefluorapatite or acid insoluble, thatis, A. I. +(P20 5 x z. 56), includes the CaO and C02 not in fluorapatite as well as nearly all the MgO, Na2u, K 20, so3, organic matter, and minor metals such: as vanadium, chromium, nickel, zinc, etc. {even some of the zirconium is in acid-soluble form); it also includes all the Fe20 3 , Al20 , and Ti02 that would be reported in separate anal~es for these constituents (only soluble iron, alumina, and titania are generally reported). Mineralogically this portion of the rock consits mainly of calcite and dolomite; pyrite, marcasite, and other iron sulfides; limonite, hematite, and other iron oxides; iron sulfates and gypsum; and organic matter. The minerals containing the soluble alumina, alkalis, and minor metals are as yet poorly defined, but they seem to be mainly of the hydromica type. Loss on ignition includes chiefly carbonate C02, organic matter, and water. It may also include some sulfur, depending upon the minerals present in the rock and the temperature reached during ignition. Loss on ignition may be taken as a rough measure of the organic-matter content if the rock contains no carbonates and little or no clay or if C02 and water have been determined and can be subtracted from the loss on ignition. An accurate total of all constituents is extremely difficult to obtain, even when all the constituents present, and this may include 30 or 40, are. determined. This partly because the accurate determination of many constituents in phosphate rock is extremely difficult and partly because the state of oxidation of many of the elements is not known. Thus, iron is generally reported as Fe2o3 but it may actually be presen_t as FeO, FeS2, etc.; vanadium is reported as V 2.05 but may be present as V 0 3; and sulfur is reported as so3 but is known to te present as organic, sulfide, and sulfate compounds. The same uncertainty applies to several other elements, particularly metals. Because nearly all stratigraphic sections were measured and sampled at or near the surface, the analyses reported here are of partly weathered rocks. Aside from physical disintegration, the principal effects of weathering of Phosphoria formation rocks are progressive oxidation of organic matter and leaching of more soluble constituents. In advanced stages of weathering, such as are found where the rocks immediately underlie the weathering surface developed prior to the deposition of the Tertiary Wasatch formation, the organic matter is so completely oxidized and removed that the rocks are white, light gray, or pink in color. Relatively soluble constituents, including calcium carbonate and minor metals like vanadium, are leached out, so that only the more insoluble constituents remain. In less-advanced stages of weathering, such as those characteristic of the present weathering cycle and of most of the rocks described here, the rocks are medium to dark shades of brown or gray and some of the more soluble materials mentioned above have been leached out. Judging from the rocks exposed on various levels in the Anaconda Copper Mining Company mine at Conda, the P 0 5 content of such moderately weathered rocks maybe one or two percentage points higher than in unweathered rocks at depth. CLASSIFICATION AND NOMENCLATURE OF ROCKS OF THE PHOSPHORIA FORMATION Rocks of the Phosphoria and adjacent formations consist of mixtures of three types ofmaterials: ( 1) detrital silicates--principally quartz, clay, mica, and feldspar; (2) chemical precipitates--dominantly the isotropic carbonate-fluorapatite {collophane), calcite, dolomite, and chert but locally including minor amounts of pyrite or marcasite, gypsum, and glauconite; and {3) carbonaceous matter. Most of the detrital materials are silt or clay size in southeastern Idaho, but sand-size particles occur in other parts of the field. Many of the chemical precipitates, particularly the phosphates, are aggregated into pellets or nodules which give a coarse-textured appearance. Because the rocks are mixtures and because they were deposited under similar physical conditions, they are remarkably uniform in appearance and they are difficult to differentiate, especially in the field. For this reason, the majority of the names applied to the rocks in the field have been revised or modified on receipt of chemical or petrographic analyses. The most significant property of the rocks is their composition, and this has been used as the principal basis in naming them. As the rocks are mixtures, their composition seldom can be described by the use of a noun alone. The rock names reported here, therefore, generally consist of a noun, chosen to represent the dominant constituent, supplemented by adjectives representing each constituent that makes up more than 20 percent of the rock, listed in order of decreasing abundance. Nouns describing nonsilicate rocks include phosphate rock, limestone, and dolomite. The choice of these names is not influenced by texture, whether colloform, crystalline, or fragmental. Silicate rocks, that is, those rocks that contain a predominance, either individually or collectively, of silicate minerals such as chert, quartz, clay, mica, and feldspar, are subdivided into sandstone or mudstone, depending upon whether the larger percentage of these materials is sand size ( 1/ 16-2mm) or is finer-grained, or into chert. Because it is seldom possible to differentiate silt-size from clay-size particles in the field, and frequently not possible to do it in thin sections, in carbonaceous rocks such as these, the term mudstone has been used to include all detrital rocks containing particles smaller than sand size. Quartzite has been used to describe a sandstone so well cemented that the rock breaks through, rather than around, most of the grains. Derivatives of all these nouns are used as adjectives--phosphatic, calcareous, dolomitic, cherty, sandy, argillaceous (silt and clay not differentiated} if the respective constituents make up 20 percent or more of the rock. Other constituents that generally do not make up 20 percent or more of the rocks, such as gypsum, glauconite, limonite, and fluorite, are mentioned, if they seem unusually, abundant, by preceding the constituent name with 'contains". Because nearly all rocks of the phosphatic shale member contain carbonaceous matter, though rarely in excess of or even approaching 20 percent, this constituent is generally not recognized in the rock name. Attention should be called to the fact that certain rock names--shale (which, where rigorously defined, is a fine-grained fissile detrital rock), oolite, and pisolite--are not applied here to rocks of the Phosphoria formation. These names, which are based upon structural features, have been abandoned with some misgivings, for they are easy to use in the field.

FEEt LITHOLOGY j RESTRICTED THICKAVERAIE p2 O!IIN :N FEET PERCENT DESCRIPTION Rex chert member (top rot exposed) Chert: hard, black, thin-bedded Mudstone: hard, black, thin-bedded Chert: hard, brittle, dark-gray to pinkish-gray, thick-bedded Chert and limestone: 80 percent hard, black, thin-bedded chert; 20 percent hard, dark-gray, massive limestone Phosphatic shale member oolitic, nodular, medium-hard, light brownish-gray; contains gastropods medtlltlll-illard, brownish-gray, thin-bedded; 2-foot limestone bed at top; s in middle 12 feet stain on contains a Phosphate rock: oolitic, hard, black, thin-bedded. Lower 0.5 fo.ot contains whitP (tabular) fossil fragments 440t c=I L Wells formation Figure 2. --Generalized typical section of Phosphoria formation in southeastern Idaho

Though the term shale is discarded as a rock name, it will continue to be used as a formation name, as the 11 phosphatic shale member

The usage of the term in this sense for a group of fine-grained thin-bedded, but not necessarily fissile, detrital rocks is so firmly entrenched in stratigraphic nomenclature that it would be useless to try to displace it, even if it were desirable to do so. STRATIGRAPHY OF THE PHOSPHORIA FORMATION IN SOUTHEASTERN IDAHO At its type locality in southeastern Idaho (Richards and Mansfield, 191Z), the Phosphoria formation consists of a lower member, the phosphatic shale, about 180 feet thick and an upper member, the Rex chert, about Z40 feet thick; another member, a thin-bedded cherty mudstone 15 to 75 feet thick, overlies the Rex chert in most of southeastern Idaho and western Wyoming, though it is not well defined at the type locality. The Phosphoria formation overlies the Pennsylvanian Wells formation and underlies the Triassic Dinwoody formation. The upper 50 to 75 feet of the Wells formation consists of gray fossiliferous cherty limestone that contains some thin phosphatic layers. It may be the correlative of the lowermost member (A member) of the Phosphoria formation in Montana and the lower limestone member of the Park City formation in Utah (McKelvey, 1949). In southeastern Idaho most of the phosphatic beds are in the phosphatic shale member, and it is on this member that most of our studies have been focused. It consists of many thin layers, some of which persist over the whole area. They may be grouped into several broad units, as yet unnamed, as shown in figure _1. STRATIGRAPHIC SECTIONS Abstracts of stratigraphic sections measured at 1 Z localities, and the available analytical data, are presented in the following pages. Their locations, as well as the locations of others to be reported later, are shown in plate 1. The semiquantitative spectrographic analyses are based upon comparisons with a standard plate representing known quantities of the elements tested for and made at the same exposure. Greater sensitivities for many elements can be obtained by additional exposures. The standard sensitivites for the elements noted in this report are as follows: Element Al Sb As . Ba Be .. . Bi . B Cd Ca Cr Co Cu . Ga Ge Au In Fe . Pb Percent .OS . ooz . oz 05 1 Element Li . Mg Mn Hg . Mo . Ni p Pt . Si Ag . Na Sr . Ta . Sn Ti w . v . Zn Zr Percent o.z 8 . ooz 1 . ooz REFERENCES Clabaugh, P. S., 1946, Permian phosphate deposits of Montana, Idaho, Wyoming, and Utah: U. S. Geol. Survey, Strategic Minerals Investigations Preliminary Map 3-198. Hoffman, James J., and Lundell, G. E., 1938, Analysis of phosphate rock: U. S. Bur. Standards Research Paper 1095. Huleatt, William P., 1950, Automatic sample preparation saves time, money for U.S. G. S.: Eng. and Min. Jour., vol. 151, pp. 6Z-67. Long, A. E., 1949, Experimental diamond core-drilling in the Phosphoria formation in southeastern Idaho: U. S. Bur. Mines Rept. lnv. 4597. Mansfield, G. R., 19Z7, Geography, geology, and mineral resources of part of southeastern Idaho: U. S. Geol. Survey Prof. Paper lSZ. References to other areas are listed by Clabaugh, 1946. McKelvey, V. E., 1949, Geological studies of the western phosphate field: Am. Inst. Min. Met. Eng. Mining Trans., vol. 184, pp. Z70-479. McKelvey, V. E., Smith, L. E., Hoppin, R. A., and Armstrong, F. C., 195Za; Stratigraphic sections of the Phosphoria formation in Wyoming, 194 7-48: U. S. Geol. Survey Cirettlaz ll9. T&I-/IY McKelvey, V. E., Smith, L. E., Kinney, D. M., Huddle, J. W., Hosford, G. F., Sears, R. S., Sprouse, D. P., and Stewart, M. D., 195Zb, Stratigraphic sections of the Phosphoria formation in Utah, 1947-48: U. S. Geol. Survey CiPGIW:lar i!HT£1-1~ Richards, R. W., and Mansfield, G. R., 191Z, The Bannock overthrust: a major fault in southeastern Idaho and northeastern Utah: Jour. Geology, vol. zo, p. 684. Swanson, R. W., Klepper, M. R., Lowell, W. R., Honkala, F. S., Cressman, E. R., Bostwick, D. A., Payne, 0. A., and Ruppel, E. T., 195Z, Stratigraphic sections of the Phosphoria formation in Montana, 1947-48: U. S. Geol. Survey Gire~:~laP

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,. . l ' DIAMOND DRILL HOLE a. FORT HALL MINE. IDAHO. LOT NO. 1279. Part of phosphatic shp.le member of Phosphoria formation cored in diamond drill hole s. near diamond drill hole 237 at Fort Hall Samples analyzed for eU and Mine of J. R. Simplot Company. sec. 14. T. 4 s R. 37 E Bingham County. Idaho. Hole drilled in October 1948 by U.S. Bureau of Mines. chem. U by the U.S. Geological A. E. Lon1 in charge. and core measured and sampled by D. F. Davidson. Samples analyzed by U.S. Bureau of Mines Laboratory. Albany. Survey Laboratory. Geochemistry Oregon. and Petrology Branch. Bed Sample Thickness Cumulative Thickness x Ura~ium content Rock description (percent Thickness x no. no. (feet) thickness percent P20 (percent) l Acid percent eU P2o5 insoluble (feet) (cumulatlvef eU JChem. U (cumulative) Phosphatic shale member of Phosphoria formation-lower beds only p -35 Mudstone and phosphate rock DFD-1144 40.Z5 p -34 Mudstone and phosphate rock DFD-1145 15,8 p -33 Limestone. argillaceous DFD-1146 P -3Z Phosphate rock. argillaceous. calcareous DFD-1147 o. 7 p -31 Mudstone. phosphatic. calcareous DFD-1148 l.H p ~30 Limestone DFD-1149 p -29 Core missing p -28 Mudstone. phosphatic DFD-1150 .00'/ p -27 Mudstone. phosphatic DFD-1206 p -26 Phosphate t'ock. calcareous. argillaceous DFD-1207 P -25 Phosphate rock. calcareous. argillaceous DFD-1208 p -24 PhospHate rock. calcareous DFD-1209 p -23 Limestone. phosphatic DFD-3336 ·'- P -22 Phosphate rock DFD-1248 1. & p -Z.l Phosphate rock. argillaceous DFD-12.49 P -zo Mudstone. phosphatic DFD-1250 l.Z p -1~ Phosphate rock. argillaceous. calcareous DFD-1251 p -18 Phosphate rock. argillaceous DFD-1252 p -17 Phosphate rock. argillaceous DFD-1253 p -16 Phosphate rock. argillaceous DFD-1254 2!l.3 p -15 Core missing p -14 Mudstone. phosphatic DFD-1255 o. 5 p -13 Mudstone. phosphatic DFD-1256 P -12 Phosphate rock DFD-1257 p -11 Phc.4phate rock, argillaceous DFD-1258 p ·10 Phosphate rock and muclatone DFD-1259 z.o la.5 p - 9 Phosphate rock and mudstone DFD-1827 z.o p - 8 Phosphate rock and mudstone DFD-1828 p 7 Limestone DFD-1976 4Z.3 Cumulative data inoomplete due to misaina information. Computations start from zero after interruption. C) , .!J

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G r . Bed Rock description DO. p - 6 Phosphate rock p - 5 Limestooe, phosphatic p - 4 Phosphate rock, artillaceoua p - 3 Pbospbata rock p - 2 Limestone, arJillaceous, phosphatic p - Limeatooe, art!llaceoua Cw- 1 I Limestoae, arpllaceoua .. Mote incompleteness of cumulative data. Chemical analyses Sample Thickness · (percent) no. (feet) Acid P205 insoluble DFD-1977 DFD-1978 DFD-1979 DFD-1980 DFD-2170 o.s DFD-2295

Wells formation Cumulative Thickness x thickness percent (feet) (cumula UI.&S urar: ccotent rceat eu ICbem. u ·"' .ooz Thickness x percent eU (cumulative)

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DIAMOND DRILL HOLE 9, FORT HALL MINE, IDAHO. LOT NO. 1Z80. Part of pboapbatic abale member ol Pboepboria formation sampled from diamond drill bole 9 near diamond drill hole Z37 at Fort Ball Mine ol J. R. 81mplotCompany, MC. 14, T. 4 S., R. 37 E., BiaibamCounty, Idaho. Bole drilled in October 194i by U.S. Bureau of Mtoea, A.&. Laac iJa cbar .. , and measured and sampled by D. F. Davidaon. Sample analysed by U.S. Bureau of Mines Laboratory, Albany, OntOD Bed Sample Cbe~cal analyaes Cumulative Thickness x DO. Rock 8acriptl.on Tbiclme .. (percent) DO. (feet) I Ac1a tbiclme .. percent P~, P20S insoluble (cumulat Pboapbatic abale member of Pboepboria formatioo--lower beds only p ·34 MudatOM, calcareoua Dl'D-~97 u.s p ·3J )Cudatooe, pboaphatic DFDZZ91 p .sz Mudatoae, pboapluatic, calcareoua DFD-2299 P ·Sl Limeatoae DFD-2300 p ·30 llvdatoae, pboapbatic, calcareoua DFD-3035 11. ·s

p -29 Con m.lainl P -za Limeatoae DFD-2468 p ·21 lludatoae, pboapbatl.c DFD-2469 p -26 Pboapbate rock, artiUaceoua DFD-2470 p ·25 Pboapbate rock, calcareoua, arJillaceoua DFD·Z471 p ·24 Pboapbate rock anci C111l aua MI·t.e DFD-247Z 14.Z p -23 Pboapbate rock aad mudatone DFD-2473 Pboapbate rock, calcareoua, arJillaceou DFD·2474 P -21 Pboapbate rock, calcareoua DFD-2475 p ·20 PhcMpbate rock, arJillaceou DFD-2531 p ·19 Phosphate rock, arpllaceoua DFD-2532 p -18 LimM._ DFD-2533 2Z. 1 p -17 Mudatoae, pboaphatic, calcareou DFD-2534 p -16 Pb011phate rock and mudatone DFD-2535 p -15 Pboapbate rock and mudatone DFD-2536 p ·14 Pboapbate rock and mudatone DFD-2537 p -13 Limeatoae DFD-2538 P -u Core miaaint p -11 Uudataae, pboapbatic, calcareoua DFD-2539 p ·10 Pboapbate rock and mudatone DFD-2540 Z7.6 p - 9 Pboepbate rock and mudatoae DFD·Z541 p - 8 Pboapbate rock DFD-2542 p - 7 Pboapbate rock and mudatone DFD-2543 2'18.99 p - 6 Limeatoae, arpllaceoua DFD-2544 4Z.1 p - 5 Pboapbaie rock, calcareoua DFD-2545 zz.o Cumulati'ft ciata incomplete due to miaaiDI iDiormation. Computatl.ona start from sero after interruption. Sample analyzed for e U and cbem. U by tbe U.S. Geological Surny Laboratory, Geochemistry and Petroloty Branch. Thickness x rcent percent eU eu ICbem. U (cumulative) .ooz ·-

:ooa .oes .ooa .ot5 .ot9 .ooz ,

w

;..

Bed no. p p p - z p CwJ CwZ Cw1 Roclr. description Limestone Core miSBiq Phosphate rock Limestone, arJillaceoua Limestone, argillaceous Core missing Limestone, arJillaceoua Sample Thickness no. (feet) DFD-2546 DFD-2547 DFD-2548 Wells formation ercent Acid Pz05 insoluble Cumulative thickness (feet) 5o. a o. 1

Cumulative data incomplete due to missing information. Computations start from zero after interruption. Note incompleteness of cumulative data. Thickness ll: percent ~or (cumula e 35.75* l.ij9 Ur~ium ctltent (percent eu ICbem. u Thickness ll: percent eU {cumulative) ,,

+-

,, CALDWELL CANYON, IDAHO. LOT NO. 1Z60. Phoepbatic abale member ot Phosphoria formation sampled in bulldozer trench on north side ot Caldwell Canyon, sec. 1, T. 8 S., R. 43 E., Caribou CountJ, Idaho, on eaat limb of Slug Creek syncline. Beda strike N. 10 w. and dip 40 E. Section measured by R. A. Hoppin, D. F. Davidson, and F. W. ~Malley and sampled by R. A. Smart, R. P. Sheldon, R. G. Warinc and T. K. Rigby in August 1948. Samples analyzed for P.20.A and acid inaoluble by U. S. Bureau ot Mines Laboratory, Albany, Oregon, and for other conatituenta by Trace Elements Section Laboratory, U. :s-. Geological Survey, Wuhiqton, D. C. Bed no. Rook description Rex member of Phosphoria formation--basal bed only Cumulative thickness (feet) Tbickneaa x percent P 0 (cumulat~f Samples analyzed for eU and chem. U by the U. S. Geological Sarwy Laboratory, Geochemistry and Petrology Branch. Thickness x percent eU (cumulative) R- IIebert I woM-1750 I 3.5 I o.41 I -- I -- I Phosphatic shale member ot Phosphoria formation! P-14 Mudataae WOM-1749 5. z s. 70 P-IS Mudataae WOM-1748 l.Z z. 3 .ooz P·IZ Mudatcme WOM-1747 13.U P-81 llud8t0Mr foe. col. ao. te-JES-189z WOM - 1746 Z.7 .ooz P·IO MWlatooe. calcareoua WOM-1745 Z.4 16.Zl .OZI P-79 Limestaae, argillaceous: foa. col. DO, 48-JJ:S-188 WOM-1744 .ooz . OZ3 P-78 Mudataae, calcareouas fos. col. no. 48-JBS-117 WOM-1743 Z.7 Z5.78 P-77 Mudatoae, phoepbatlc WOM-1741 30. ZZ .oos P-76 lludatoae WOM-1741 z. 3 33. Zl P-75 Pboapbate rook, arpllaoeoua WOM-1740 u. 1 Zl.Z 4S.Z6 P-74 lludatODeJ foa. col. no. 48-JES-186 WOM-1780 z. 5 P-73 Mudataae, ealcareoua; foe. col. no. 48-JES-115 WOM-1779 o.z sz.o so:z1 . osz P-72 Pboapbate rook WOM 1778 3Z.9 liZ. 78 P-71 Phoepbate rook; foa. col. DO. 48-JES-184 WOM-1777 Z9.1 . 08Z P-70 lllldatOM WOM-1776 58.Z P-69 Pboepbate rock, calcareoua WOM-1775 Z4.9 zo.8 .09Z P-68 Phosphate rook WOM-1774 .01Z Limeat.e coacretiQDJ fos. col. no. 41·JJ:S-18S WOM-1773 (0. 9) z. z .ooz P-67 Pboapbate rock, calcareous and phosphatic calcareous mudatoaes foe. col. no. 41·JJ:S-18Z WOM-177Z zs. 0 Z4.6 Z45.80 .IZ6 P-66 Mudatone, phosphatic WOM-1771 1Z.7 Z5.6 ZS8.50 .13Z P-65 Phoapbate rock, argillaceoua Dli'D- 1790 18.0 I -- J7.3 Z6.9 Z81.90 P-64 lludatoaer foa. col. DO. 48-JES-111 DFD· 1789 1.) 63,3 Z8.Z Z91.78 1 The tbhmeaa ot the Pboapbatic ahale member ia probably due to faulting. z J'ouU collection by J. ll. Smedley, Pa1eontol01f and Stratiaraphy Branch, U.s. Geological Survay.

£?.

( ') i:f'

Bed no. P-63 P-62 P-61 P-60 P-59 P-5& P-57 P-56 P-55 P-54 P-53 P-51 P-50 P-49 P-48 P-47 P-46 P-45 P-44 P-42 P-41 P-40 P-39 P-38 P-37 P-36 P-35 P-34 P-33 P-32 P-31 P-30 Sample Thickness Chemical analyses (percent) Cumulative Thickness x Rock descripUoa LOSS Oil Acid thickness percent P 0 no. (feet) Pz05 Al2o3 Fe2o3 ipition insoluble (feet) (cumu1atJ.te, Limestone lens ? , &J'Iillac~ DFD- 1788 (0.9) o. 5 ,hosphatic, foa. col. no. <h-JES-180 DFD- 1787 8, 5 Mudstone, phosphatic DFD- 1786 0,7 Phoephate rock, arpllaceoua, foa. col. no. 48-JES-179 DFD- 1785 Mudstoae, phosphatic DFD- 1784 MudstoDe, phosphatic, fos. col. no. 48-JES-178 DFD- 1783 Mudstone, phosphatic DFD- 1782 Mudstone, fos. col. no. 48-JES-177 DFD- 1731 Mudstone DFD- 1760 Mudstone DFD- 1759 422.4Z Mudstone, phosphatic DFD- 1758 Phosphate rock, arpllaceous DFD- 1757 Mudstone, phosphatic DFD- 1756 Mudstone, phosphatic DFD- 1755 Mudstone DFD- 1754 Mudatone, phosphatic DFD- 1753 Mudstone DFD- 1752 Mudstone, fos. col. no. 48-JES-176 DFD- 1751 Phoaphate rock and phosphatic mudstone WOM-1810 sol. 10 Mudatoae, phosphatic WOM-1809 0,7 Mudstone WOM-1808 Many of the beds from P-27 to P-43 show prominent sheariDI that probably represents faultina and accounts for the abnormally small thiclmess of the phosphatic shale member at this locality. Phosphate rock WOM-1807 Mudstoae, phosphatic WOM-1806 Madatoae WOM-1805 Mudstoae WOM-1804 Mudstone WOM-1803 Mudstone, phosphatic WOM-1802 Mudstone WOM-1801 2. 8? Mudstone, calcareous WOM-1800 Phosphate rock WOM-1799 Mudstone, phosphatic WOM-1798

61. so Phosphate rock, arpllaceous WOM-1797 Mudstone, calcareous WOM-1796 Mudstoae, phosphatic WOM-1795 0,5 Mudstone, phosphatic, fos. col. no. 48-JES-175? WOM-1794 Uranium content (percent) eu Cbem. U ,003 .ooz ; ,003 Thickness x percent eU (cumulative) . zoo ea _.a

C)

P-Z9 Mudstone WOM-1793 0,4 7Z.2 ,003 P-28 Mudatooe WOM-1792 P-27 Mudstone WOM-1791 P-26 Mudstone, phospbaUc, calcareous WOM-1820 l.Z P-25 Mudstone, phosphatic WOM-1819 P-24 Mud&toae. phoaphaUc WOM-1818 13. z rz-·- P-Z3 Phosphate rock, ariel1aceoua WOM-1817 Zl. 2 7Z7. 92 P-ZZ Phosphate rock, arpllaceoua WOM-1816 73.1SO r·~ .,, P-21 Limestone WOM-1815 s. 9 P-20 Limestone, foa. col. no, 48-JES-174 WOM-1814

P-19 Phosphate rock, arpllaceous WOM-1813 ,008 P-18 Mudstone, phosphatic, c.Ucareous WOM-1812 ijl' r P-17 Mudstone, phosphatic: fos. ool. no. 48-JES-173 WOM-1811

P-16 Limestone; fos. col. no. 48-JES-172 RAH- 1826 lZ. 7 If.,. P-15 Phosphate rock, arpllaceous RAH- 1825 6.9Z i.r , P-14 Phosphate rock RAH- 1824 P-13 Phosphate rock, araillaceoua RAH- 1823 1. 3Z

P-lZ Limestone, arJillaceoua; fos. col. no. 48··JES-171 RAH- P-11 Ph~phate rock RAH- 1821 1, 000. 15 tfP-10 Phosphate roek RAH- 1770 1,037.98 c:

P- 9 Phosphate rock RAH- 1769 0,42 1,103.58 - J P- 8 Phosphate rock RAH- 1768 1 oz. 50 1, 151. 58 P- 7 Limestooe, phoaobatic, ar,Waceoua: loa. col. no. 48-JES-170 RAH- 1767 1, 164. 19 P- 6 Phosphate- rock RAH- 1766 0,85 1, 191.09 P- 5 Limestoae RAH- 1765 1, 195.99 P- 4 Phosphate rock,· foa. col. no. 48-JES-169 RAH- 1764 3. 3? 1,279.48 P- 3 Limestone.; los. col. no. 48-JES-168 RAH- 1763 z.s o. so 111. 6u 1, 285. 23 P- Z Limestone and phosphate rock.; los. col. no. 48-JES-167 RAH- 1762 z. 56 1, 301. 15 ,005 P- 1 Phosphate rock RAH- 1761 1,436.25 ,009

Wells formaUon ,, I : Limestoae, loa. col. no. 48-JES-166 RAH- 1739 t,IS

t I

· J J MABIE CANYON, IDAHO. LOT NO. lZlO. Pbo8pb&Uc sbale member ol Pboepbor1a formaUoa sampled in bulldoaer trench in Mabie Canyon, NW!NE! HC. 10, T. 8 S., R. 44 E., Caribou ldabo, oa east limb ol Dr7 Valle7 anticline. Section measured by R. M. Campbell, V. E. McKelveJ, and R. A. Weeks and sampled "7 Campbell aDd w .. u lD S.ptemr aDd October 1947. Samples analJSeu by U. S. Bureau of Mines Laboratory, Albany, Ore1oa. Bed DO. aoek clescripUoa a.. member of ~plloorla formatia.-baaal ada onq a 5 Cbart TEM-,70-47 R Limestoae, arJillaceous VEM-469·47 l.Z 3Z.O a 3 Chert VEM-468-47 a z Mudstone, calcareous; fos. cel. DO. 47·RW·Z59 VEM-467·47 o. 5 Zl. Z B 1 Mudstoae, calcareous and chert VEM-466·47~ Phosphatic sbale member of Phosphoria formaUoa p -170 Mudstone, calcareous VEM-465-47 p ·169 Phosphate rock, arpllaceous, calcareous; los. col. no. n-aw-zsa VEM-464-47 ZO.l lZ. Z p -168 Mudstone, calcareous; fos. col . DO. U·HW·Z57 VEM-463-47 Z.9 p -167 Mudatone, calcareous VEM-46Z-47 z. 1 3.Z 1Z.7 p ·166 lludateM VEM-461·47 -· Limestoae lens, arrllaceous, lD top ol bed P·lb VEM-460-47 (O. o-o. s) o. 7 -· p ·165 lludatoae VEM-459-47 l.Z Z.6 a. 1 p ·164 Mudstone, calcareous VEM-458-47 Z.4 Z.4 p -163 Mudstone, calcareOU8 VEM-457-47 lZ.O P ·16Z lludatone, calcareous VEM-456-47 Z.4 p -161 Llmestoae; foe. col. DO. 47·RW·Z55 VEM-455·47 z.z p ·160 Uuclstoae, calcareous; foe. col. DO. 47·BW-Z54 VEM-454-47 p -159 Mudstone, calcareous; fos. col. VJ:M-453-47 9.Z Z.7 lZ. 7 p ·158 Limestoae, arJillaoeous. cOGtalns pbospbaUo nodules VEM·45Z-47 Z7. 5 p -157 Mudatooe, oalcareoua VEM-451-47 9.Z l.Z p - 156 Phoapbate rook. arpllaoeous, YEM_.!0-47 0,5 S.l p -155 Mu1TfCla; fa.. caL ao. 4'J..W-Z5l YEM-M9·'7 Z.f J.l S,l Z5.9 Z6.6 ZZ. 5 5Z.5 6Z. 4 Z4.3 Z8.5 Cumulative thickness (feet) 3.Z lO.Z lZ. 1 15. z 1(). 7 Z0.4 Z0.9 a!.l Thickness x percent P 20 6 (cumulatl\'eJ z.z6 3.Z8 15.6J Zl. 14 35,87 Sa~ anaq..d for eU aad cllem. U by tbe U. s. GeolDgica.l Sllrft7 Lehontgry, Geocbemiatry ,, ud PetrolotD' Bran.:h. .ooz .oos .ooz .oos .ooz .ooz .ooz .00] Thickness x percent eU (cumulative) . ooz .OZ4 .04Z .04Z

.06!J

Cj

p -154 Lila .. arpllaoeoaa foe. ool.ao. n--·1U VJ:II-441-47 o.z Z5.8 p ·153

VBII·o&U47 Z.4 n. 1 Z6.8 p -152 Phoapbate rock VBII·446-o&7 p ·151 Pboapb&te rock VBII·445·47 Z7.8 .on P -uo Phoapbate rock VJ:II444 ·4 7 3. 7Z Z8.5 p -149 lludatone, calcareoua; foa. col. no .U-BW-251 VJ:II-4o&3-47 '· 1 p -148 Pboapbate rock. ar(!ill.aceoua VEII-442·47 zs. 5 Z5.1

p ·147 Phoaplaate rock VEII-441-47 p -146 Phoapbate rock VEM-440·47 P -IU lludatone, pboepb&Uc: foa. col. no. 47-BW-250 VEM-439-47 I. so r p ·144 Phoapbate rock VEM-438-47 267.6Z p -14l Phosphat. rock and mudatone VEM-437-47 Phoapb&te rock and mudstone VEM-436-47 IZ. 9

p -141 lludatone, ca1careoua VEM-435-47 . 15Z p ·1" Pboapbate rock and calcareoWI mudstone VEM-434-47 P ·1391 Pboapbate rock VEM-433-47 P -138 Phoapbate rock VEM-432-47 P -137 Phoaphate rock VEM-431-47 Liuull-'ooe lena 0. z foot below top rA bed P-131 VEM-430-47 (0. 0-0. 5) o. 1 p -136 Phosphate rock VEM-429-47 p -135 Phosphate rock VEM-428-47 .ou . Z33 p -134 Phoapbate rock VEM-427-47 p -133 Phoaphate rock and mudstone VEM-426-47 P -132 Phoapbate rock, arJillaceoua VEM-425-47 '"' to.. p -131 Phoapbate rock VEM-424-47 o. 7 4'5.8 p -130 Pboapbate rock VEM-423-47 p -129 Pboapbate rock, arJillaceous VEM-422-47 p -128 Phosphate rock, arJillaceoua VEM-421-47 p -127 Phoapbate rock, arlillaceous VEM-420-47 p -126 Mudstone, phoaphaUc VEM-419-47 p -125 Mustone, phoaphatic VEM-418-47 p ·124 Mudstone, phosphatic VEM-417·47 1. z -· P ·123 Mud atone VEM-416-47 . 3Z4 P -uz Limeatone, arJillaceous; foa. col. no. 47-BW-Z49 VEM-~15-47 z.o P ·Ul Mudaton.. phoapb&tic VEM-414·47 1Z.4 z. 5 16. z z FoaaU collection by R. Wedow, Pa1eontolou and StratiiJ'aphy Branch, U.S. Geolotical Survey. Sample loat.

lf'.ll'.!.ll., ow t' Bed ao. P ·lZO p -119 p -118 p -111 p -116 p -115 P ·1U P ·1U p -111 p -111 p -110 p -109 p -108 p -107 p -106 p -105 p -104 p -103 p p -101 p ·100 p - 99 p p p - 96 p -

p - 94 P-95 p -

p - CJl p - 90 p p - 88 p - 87 p - 86 p - 85 p - 8. Rock deacriptiOD llhdlltone, phosphatic Phoapbate rock, ar,ulaceoua Mudatone, pboapbatic Mudatone, phosphatic Mudatcme Mudatone, phoapbatic Mudataaa. phoapbatic phoapbatic aodulea Pboapbate rock, argillaceous Mudstone, contain phoapbatic nodule a Mudstone, phosphatic Mudatone, phoapbatic Mudstone, phosphatic Mudatone; foa. col. rao. 47-HW·Z48 Limestone; loa. col. no. 47-HW-243 Mudatone Phosphate rock and mudstone Phosphate rock, artillaceous Mudatone Mudatone Mudatone, calcareous Mudatone, phosphatic Mudatone Mudatone Mud atone Mudatone Phosphate rock Mudatone Mudatone, calcareous, phosphatic MudatODe and phoaphate rock Phoaphate rock, areillaceoua Mudatone Mudatone and phosphate rock; loa. col. DO. 47-HW-242 Mudstone Llmeatooe, artillaceoua Mudatone and pboapbate rock Mudstone · Sample Thickness no. (feet) VEM-413-47 VEU:-412-47 VEM-411·4 7 VEM-410-47 VEM-409-47 VEM-408-47 VEM-407-47 VEM-406-47 VEM-405-47 VEM-404-4:'1 VEM-403-47 VEM-402-47 VEII-40 1-4 7 VEM-400-47 Z.6 VEM-399-47 VEM-398-47 VEM-397-47 VEM-396-47 VEM-395-47 VEM-394-47 VEM-393-47 l.Z VEM-392-47 VEM-391-47 VEM-390-47 VEM-389-47 VEM-388-47 VEM-387-47 VEM-386·47 VEM-385-47 VEM-384-47 VEM-383-47 VEM-382-47 VEM-381-47 VEM-380-47 VEM-379-47 VEM-378-47 VEM-377-47 Chemical analyses (percent) LOSS on Pz05 Al2o3 Fe2o3 F ignition 10. z Z.5 z. z Z.2 8,6 8. s 3.Z Z,8 z. 5 1:1.9 Z.7 o. 7 z. 7 8,2 7,4 Z7.9 z.s 8,2 2.a 3. z 5,0 4.Z Cumulative Thickness x Thickness x AClcJ thickness percent PR,Of rcent) percent eU insoluble (feet) (cumulat e eU Chem. U (cumulative) ,006 c;9.40 7Z7.41

, 65.ZO ,004 ,., 68,70 ,005 857. 7Z ! r ( 86Z.62 ( .4ZI 900. 7Z .4Z5 .ooz .43Z 7Z. 1 924.9Z .ooz ,003 88,80 ,004 1, 004. ss 1,013.52 .ooz 1,014.32 1, 032.08 ,003 1,032.48 .ooz

'

P-83 Mudatcae aD4I calcanoua muclatcae VEM-376-4.7 1,033.60 p - 82 lludatoae aod pboapbate rook Vl!:ll-375-4.7 1, 04.0. 95 p - 81 Mudatmw aod plloepbate rock Vl!:ll-374.-47 1,069.37 p - 80 Muclatoae VEM-373-4.7 1, 071. 07 p - l9 Phoapbate rock VEM·37Z·4.7 lZ.O 1, 103. 27 p - i8 Phoaphate rock and muclatone VEM-371·47 l,ll8.25 p - 77 Mudatoae VEII-370-47 6.'7 1, 120.4.9 .ooz

p - 76 Phoaphate rook and mudata~W VEM-369-4.7 ZZ.5 3Z.O 1, 140. 74.

p - 75 Mudatoae, phoaphatio VEII-368-47 1, 144.. 58

p - 7. Mudatou VEM-367-4.7 1, 148.43 .ooz , p - 1) Mudatou, p~tic VEM-366-47 1, 161.03 p- u lludatoae VEM-365-47 1, 162. 20 p - " Mudatone VEM-364·47 1,166.04

p - 70 Phoaphate rock, arlfilaceoua VEM-363-47 1,172.88

p - 69 Phoaphate rock VEM-362-47 24,3 1, 189. 89 p - 6& Mudstone, phoaphatio VEM-361-47 1,198.77 p - 67 Mudstone, phoaphatic VEM-360·47 1, 212. 07 p - 66 Mudstone, phoapbatic VEM-359-47 1, 218.63 p - 65 Mudatone, phosphatic VEM-344-47 O.f 1, 2ZZ. 27 .OO!i p- lludstoae, calcareous, phoaphatic VEM-343-47 Z1.5 1,240.45 p - 63 Pboapbate rock, calcareous, ar1111aceoua VEM-34Z-47 2.Z 1, 256.89 p - 62 Mudatone, calcareoua, pboapbatic VEM-111-47 1,269.53 .ooz p - 61 Mudstone, calcareous; foa. col. DO, 47-HW-241 VEM-3&0·47 1,271.81 .00] p - 60 Limestone; col.. ftO. 4.7-BW-24.0 VEM-339·47 o. 3 1,271.96

p - 59 Limestone; foa. col. no. 4.7·HW-239 VEM-338-47 1Z6. 90 1,272.41 f ·.Jcr9J p - 58 Mudawne, calcareous: fos. col. ,) DO, 4.7·BW·Z38 VEM-337-4.7 1,274..39 ,001 p - 57 Limestone; foa. col. no. 4.7·BW·Z37 VEM-33(.-4.7 o. 3 1,275.4.7 p - 56 Chert; foe. col. no. 47-HW-236 VEM-335·47 1, 275. 77 p - 55 ll~atone; foa. col. no. 47·HW·Z35 VEM-334-47 1, 277.57 .ooz p - 54 Mudstone, calcareous VEM-333-47 134.fO 1,181.92 p - 53 Mudatone VEM-332-47 1,284.81 .ooz P 5Z Mudatone, calcareous VEM-331-47 1,291.37 .ooz p - 51 Muclatone, foa. col. no. 47-HW-234. VEM-330·47 l.Z 1,295.81 .ooz p - 50 Mudatoae VEM-329·47 1,306.69 p - 4.9 Muclatooe VEII-328-47 1,309.41

Bed I Sample I Thiclmess "'uvu.u"''- a~&alJ''III:fG \p8& "'vaa'J Cumulative Thickness x Ur(!:~ co3tent Thickness x DO. Rock descripdoa (feet) P205 Al2o3 Fe2o3 F Loss on AC1CI thickness percent ~or rcent percent eU no. ignition insoluble (feet) (cumula e eU Chem. U ( c:waalati ve) p - 48 Mudstone, phoaphatic RIIClOf-47 1,330.81 p - 47 Mudatoae RIIC·lOS-47 1, 334.41 p - 46 loludstoDe and calcareous mudatoae RIIC-101·47 1,341.55 p - 45 Limestaae; fos. col . . no. 47-HW-233 RIIC-10141 o. 6 1,342.21 p - 44 Mudstone, calcareous and rphosphatic, calcareous mudstoae RUC-10047 1,368.49 4: p Phosphate rock, arpllaceous RIIC· 99-47 1,381.51 p Phosphate rock, arpllaceous, calcareous RMC- 98-47 1,388.86 p - 41 Mudstone, calcareous, phosphatic RMC· 97-47 Z.1 1, 40(,, 86 p Mudstone, phosphatic VEM-327·47 1:i2.8 1,410.62 p Phosphate rock, argillaceous VEM-326-47 1, 423. 66 p Phosphate rock, arpllaceous, coataina limestone lena at top VEM-325·47 154.1S 1,U2. 26 Limestone lena between bed P-38 and bed P-37 VEM-324·47 (0.0-1.1) 1,442. 26 p Mudstone, phosphatic, calcareous VEM-323·47 1,458.91 !' p MudstoDe, phosphatic, calcareous VEM-322-47 1,474.81 r, p - 35 Phosphate rock, arpllaceoua, calcareous VEM-321·47 151$.5 1, 485.45 p Phosphate rock, fos. col. no. 47-HW-ZlZ VEM-520·47 1,528.81 p Phosphate rock, arpllaceoua VEM-319-47 1,542.01 p - 3Z Phoaphate rock VEM-318-47 1, 566.65 p - Phosphate rock VEM-317-47 1, 597.97 p Limestone VEM-316-47 l.lj 1, 602. 29 Limestoae lena, arpllaceous, phosphatic, in bed P29 VEM-315-47 (0.0-0.8) p - 19 Limes ton' arpllaceous, phosphatic VE:M-514·47 1, 610. 37 ,003 p MudstoDe, calcareous, phosphatic VEM·313·47 z. 7 z. 3 1, 636.29 p - Limeatoae VEM·31Z-47 1, 638. 27 p - Phosphate rock, calcareous, ar,ulaceous VEM-311-47 1, 653. 39 p Z5 Phosphate rock RAW· 60·47 i.O 1, 676.27 p Phosphate rock RAW· 59·47 1,699.63 . 7Z8 p - Phosphate rock RAW· 58·47 1, 738.41 p Phosphate rock, arpllaceous RAW· 49-47 1,762.59 P - Limestone, arlillaceoua, fos. col. ao. 47-Enr-124 RAW· 48·47 1,766.19

p - zo Phosphate rock p - 19 Phosphate rock Limestone lena ln bed P-18 p - 18 Phosphate rock p - 17 Phosphate rock, p - 16 Limestone, phosphatic p - 15 Limestone p - 14 Phosphate rock p - 13 Phosphate rock, calcareous; fos. col. no. n-HW·ZZ3 P - 1Z Limestone, phosphatic; fos. col. no. 47-HW-ZZZ p - 11 Phosphate rock p - 10 Phosphate rock p - 9 Phosphate rock p - 8 Phosphate rock p - 7 Phosphate rock p - 6 Phosphate rock p - 5 Mudstone, calcareous p - 4 Limestone, p - 3 Mudstone, calcareous p - Z Phosphate rock, ar&illaceoua p - 1 Phosphate rock: fos. col. no. 47·BW·ZZ1 Cw 1 I Limestone; fos. col. no. 47-HWZZO Cw Z Phoaphate rock RAW· ·&7-47 RAW· 46-U RAW· 45·47 RAW- 44·47 RAW 43-47 RAW- 4Z-47 RAW 41-47 RAW· 40-47 RAW- 39·47 RAW· 38-47 RAW· 37-47 RAW- 36-37 RAW- 35-47 RAW- 34-47 RAW· 33-47 RAW- 37.-47 RAW· 31-47 RAW- 30-47 RAW· Z9-47 RAW· Z8-47 RAW 61-47 z. 1 z.o l.(i LZ l.Z Z.6 Z.3 o.z o.z 3Z.5 Zll. 7 Z.5 o.z Z6.Z z.s Z3. 1 z.o Z6.9 3.Z zo.z Z.8 l.Z o.t o. 0.5 3Z.O 3Z.4 0. 9S 4.Z z.o z. 3 zo.s Z9.6 Wells formation 1, 795.44 Z.47 179. z 1,855.71 .OJO z.so 1, 908. 11 Z.16 18Z.9 1, 947.38 0,86 1, 955. 39 8.Z 1, 956. 99 Z.55 1,997.34 Z.04 18.Z Z, OZS. 6Z . ooz Z,041.37 r2..67 190,G z, 073. 97 3.Z1 C1. S z, 109. bl z, 148.01 3.Z4 Z, 183. 65 .OZ4 .OZ3 5.Z Z, ZOI. 71 .OZ9 c:t Z, Z45. 11 I" 13.Z Z,Z49.67 Z9.5 Z,Z50. 71 , Z, Z5Z. 3Z .00'. ZOl. 7 Z.Z56.48 Z.90 zoz. 1 Z,Z68.3Z l[ lk

"" SPECTROGRAPHIC ANALYSES-MABIE CANYON, IDAHO. LOT NO. lZlO. Semi-quantitative analyses of samples of the Phosphoria formation, Mabie Canyon, Idaho (see immediately preceding pages for location of section, thickness and description of strata, and chemical analyses of samples), made by U. S. Bureau of Mines Laboratory, Albany, Oregon. In addition to the elements listed in the table below, Sb, As, Ba.., Be, Bi, Cd, Cb, Ga, Ge, Au. In, Pb, Li, Hg, Pt, Ta, Sn, and W were looked for in all samples but were not detected. Bed Sample no. AI no. R - VEM-470-47 R - VEM-469-47 R - VEM-468-47 R - z VEM-467-47 R - VEM-466-47 p -170 VEM-465-47 p VEM-464-47 p -168 VEM-463-47 p -167 VEM-46Z-47 p -166 VEM-461-47 VEM-460-47 p -165 VEM-459-47 p -164 VEM-458-47 p -163 VEM-457-47 P -16Z VEM-456-47 p VEM-455-47 p -160 VEM-454-47 p -159 VEM-453-47 p -158 VEM-45Z-47 p -157 VEM-451-47 p -156 VEM-450-47 p -155 VEM-449-47 p -154 VEM-448-47 D p -153 VEM-447-47 P -15Z VEM-446-47 p -151 VEM-445-47 D p -150 VEM-444-47 p -149 VEM-443-47 p -148 VEM-44Z-47 Explanation of symbols B F F F F A more than 10 percent B 5-10 percent C 1-5 percent D 0. 1- 1 percent Ca Cr Co Cu E ND G A E ND G E ND G A E ND G F A E ND G F A E ND G F E ND G F E ND G F E ND G F A E ND G F E ND G F E ND G F E ND G F E ND G F A E ND G F E ND G F E ND G F A E ND G F E ND G F A E ND G F E ND G F E ND G F E ND G F E ND G F A E ND G F A E ND G F E ND G F A E ND G E 0.01-0.1 percent F o. 001-0.01 percent G less than 0. 001 percent ND "' not detected Fe Mg Mn Mo Ni Si E F E A E F E A D E F E A E F E A D E F E A D E F E A D E F E A D E F E A D E F E A E F E B D E F E A E F E A D E F E A D E F E A E F E D E F E A D E F E A E F E A D E F E A D E F E A D E F E A D E F E D E F E A D E F E A D F F E D F F E D F F E A D E F E B Ag Na Sr Ti Zn G E F E E ND G E F E E ND G E F E E ND G E F E E E G E F E E E G E E E E E G E F E E E G D F E D E G D F E E E G E F E E E G E F E E E G E F E E ND G D F E E ND G D F E E ND G E F E E ND G D F E E ND G D F E E ND G E F E E ND G D F E E ND G E E E E E G D F E E E ND ND F E E N G D F E E E G D F E E E G E E E E E G E E E E E G E F E E E G E E E D E Zr E E E E -- E E E E E E E E E E E E E E E I ,, E ! E E E E E E E E c-,

c: ",)

z.

p -147 VEM-441-47 F A E ND G D E F E B G E E E D E E p -146 VEM-440-47 F A E ND G D E F E G E E E D E E p VEM-439-47 F A E ND G D E F E A G D E E D E E p -144 VEM-438-47 F A E ND G D E F E G E E E D E E p -143 VEM-437-47 F A E ND G D E F E A G D E E D E E p -142 VEM-436-47 F A E ND G D E F E A G D E E D E E p -141 VEM-435-47 F A E ND G D E F E A G E E E D E E p -140 VEM-434-47 F B E ND G D E F E A G E E E E E E p -139 VEM-433-47 F A E ND G D F F E G E E E D E E p -138 VEM-432-47 F A E ND G D F F E G E E E D E E p VEM-431-47 F A E ND G D F F E A F E E E D E E VEM ""-430-47 F A E ND G D F F E G E E E D E E p -136 VEM-429-47 F A E ND G D E F E A F E D E D E E p -135 VEM-428-47 F A E ND G D E F E A F E D E D E E p -134 VEM-427-47 F A E ND G D E F E A F E D E D E E p VEM-426-47 F A E ND G D E F E A F E D E D E E p -132 VEM-425-47 F A E ND G D E F E A F D D E D E E p -131 VEM-424-47 F A E ND G D E F E A F E D E D E E p -130 VEM-423-47 F A E ND G D E F E A F E D E D E E p VEM-422-47 F A E ND G D E F E A F E D E D E E p VEM-421-47 F A E ND G D E F E A F D E E D E E p -127 VEM-420-47 F A E ND G D E F F A F D E E D E E p VEM-419-47 F A D ND G D E F E A F D E E D E E p -125 VEM-418-47 F A D ND G D E F E A F D E E D E E p VEM-417-47 F A D ND G D E F E A F D D E D E E p -123 VEM-416-47 F A E ND G D E F E A G D E E D E E p -122 VEM-415-47 F A E ND G E F E A G D E E D E E p -121 VEM-414-47 F A E ND G D E F E A G D D E D E E p -120 VEM-413-47 F A D ND G D E F E A G D E E D E E p -119 VEM-412-47 F A E ND G D E F E A G D D E D E E p -118 VEM-411-47 F A E ND G D E F E A G D D E D E E p -117 VEM-410-47 F B E ND G D E F E A G D E E D E E p -116 VEM-409-47 F A E ND G D E F E A G D E E D E E p -115 VEM-408-47 F A E ND G D E F E A G D E E D E E p -114 VEM-407-47 F A E ND G D E F E A G D E E D E E p -113 VEM-406-47 F A E ND G D E F E A G D E E E E E p -112 VEM-405-47 F A E ND G D E F E A G D D E E E E p -111 VEM-404-47 F E ND G D E F E A G D E E E E E p -110 VEM-403-47 F A E ND G D E F E A G D E E E E E p -109 VEM-402-47 F A E ND G D E F E A G D E E E E E p -108 VEM-401-47 F A E ND G D E F E A G D E E E E E p -107 VEM-400-47 F E ND G D E F E A G D E E E ND E p -106 VEM-399-47 F A E ND G B E F E B G D E E E E E p VEM-398-47 F E ND G D E F E A G D E E E E E p VEM-397-47 F A D ND G D E F E A F D E E D E E

Bed no. p -103 p -102 p p -100 p p p p p p p p p p p p p p p p p p p p p p p p p p p P p p p p p p p p p Sample no. VEM-396-47 VEM-395-47 VEM-394-47 VEM-393-47 VEM- 392-47 VEM-391-47 VEM-390-47 VEM-389-47 VEM-388-47 VEM-387-47 VEM- 386-47 VEM-385-47 VEM-384-47 VEM-383-47 VEM-382-47 VEM-381-47 VEM-380-47 VEM-379-47 VEM-378-47 VEM-377-47 VEM-376-47 VEM-375-47 VEM-374-47 VEM-373-47 VEM-372-47 VEM-371-47 VEM-370-47 VEM- 369-47 VEM-368-47 VEM-367-47 VEM-366-47 VEM-365-47 VEM-364-47 VEM-363-47 VEM-362-47 VEM-361-47 VEM-360-47 VEM-359-47 VEM-344-47 VEM-343-47 VEJl-342-47 Al B Ca F B F F F B F A F F F F F A F B F A F B F A F F B F F A F F F A F A F B F F A F A F F A F F F A F F F A F A F A F A F B F B F A Cr Co Cu Fe Mg Mn Mo D ND G D E F E ND G D E F E E G D E F E ND G E F E ND G D E F E ND G D E F E ND G D E F E ND G D E I' D ND G D E F E ND G D E F E ND G D E F D ND G D E F D ND G D E F E ND G D E F E ND G D E F E ND G D E F E ND G D E F E ND G E F E ND G D E F E ND G D E F E ND G E F E ND G D E F E ND G D E F E ND G D E F E ND G D E F E ND G D E F E ND G D E F E ND G D F E E ND G D F F E ND G D E F D ND G D F F E ND G D E F E ND G D E F D ND G D F F E ND G D F F E ND G D E F E ND G D E F E ND G. D E F D ND G D E F D ND G E E Ni Si Ag Na Sr Ti Zn Zr E A G D E E D E E E A G D F E E N E E A G D F E E N E E A G D F E D E E E A F D E E D E E E A F D E E D E E E A G D F E D E E E A G D E E D E E E A G D E E D E E rE A G D D E D E E E A G D E E D E E

E A F D E E D E E E A F D E E D E E E A F D D E D E E E A F D E E D E E E A G D E E E ND E E A G D F E E ND E E A G D F E E ND E E A G D F E E ND E E A G D F D E ND E E A G D F E E ND E E A G D E E E ND E E A G D E E E ND E E A G D F D E ND E E B G D D E E ND E E A G D D E E ND E E A G D F D E ND E E A G D E E E ND E E A G D F E E ND E E A G D F E D ND E E A G D E E E ND E E A G D F D E ND E E A G D F D E ND E E A G E E E E E E E G E E E E E E E A G D E E E E E E A G D E E E E E E A F D D E E E E E A F E E E D E E ··- E A G D E E D E E

P - 6Z VEM-341-47 F A E ND G E E E A G D E E D E E p - VEM-340-47 -· p - VEM-339 -47 F A E ND G D B E F E G E F E E ND E p VE!.I-338-47 F A E ND G D B E F E G E F E E ND E p - 58 VEM-337-47 F E ND G E F E A G D F E E E E p - VEM-336-47 F A E ND G B E F E B G E F E E ND E p - 56 VEM-335-47 F E ND G D D E F E A G E F E E E E p VEM-334-47 F E ND G D E F E A G D F E E E E p VEM-333-47 F E ND G D E F E A G D F D D E E p - VEM-33Z-47 F E ND G D E F E A G D F D D E E p - 5Z VEM-331-47 F A E ND G D E F E A G D E D E E E p - VEM-330-47 F E NO G D E F E A G D E D E E E p - VEM-329-47 F A E ND G D E E E A G D E D E E E p - 49 VEM-3Z8-47 F E ND G D E F E A G D F D E ND E p - 48 RMC-104 - 47 F B E ND G D F F E A G D E E E E E p - 47 RMC-103-47 F E ND G D F F E A G D F E E E E p RMC-102-47 F E ND G D F F E A G D F E E E E p RMC-101-47 F A E NO G F F E G D E E E E E p RMC-100-47 F A E ND G F F E A G D E E E E E p - 43 RMC- 99-47 F A D ND G D F F E A G D E E E E E P - 4Z RMC- 98-47 F A E ND G D F F E A G D E E E E E J p RMC- 97-47 F A E ND G F F E A G D E E E E E p - 40 VEM-327-47 F A E ND G D E F E A G D E D E E E p - VEM-326-47 F A E ND G D F F E A G D E E E E E p VEM-325-47 F A E ND G D E E E A G D E E D E E VEM-324-47 -· p - 37 VEM-323-47 F A E ND G D E E E A G D E D D E E p - 36 VEM-322-47 F A E ND F D E E E A G D E D D E E p VEM-321-47 F A E ND F D E E E A G D E E D E E p - 34 VEM-320-47 F A D ND F D F F E B F D E E D E E p - VEM-319-47 F A D ND E D F E E A F E E D E E P - 3Z VEM-318-47 F A E ND G D F E E G E E E D E E p - VEM-317-47 F A E ND G F E E G E E E D E E p - 30 VEM-316-47 F A E ND G B E F E B G· E F E D E E VEM-315-47 F A E ND G E F E A G D F E D E E P - Z9 VEM-314-47 F A E ND G E F E A G D F E D E E P - 28 VEM-313-47 F A E ND G E F E A G E F E D E E P - Z7 VEM-31Z-47 F A F ND G D B E F E A G D F E D ND E P - 26 VEM-311-47 F A E ND G F F E A G D E E D E E P - Z5 RAW- 60-47 F A E ND G D F F E B F D E E D E E P - Z4 RAW- 59-47 F A E ND G D F F E B G E E E D E E P - Z3 RAW- 58-47 F A E ND G D F F E B G E E E D E E p - zz RAW- 49-47 F A E ND G D F F E A G D E E D E E P - Zl RAW- 48-47 F A E ND G F F E A G D F E D ND B p - zo RAW- 47 .. 47 F A E ND G D F F E B G D E E D E E

Bed Sample no. Al B Ca Cr Co Cu Fe Mg Mn Mo Ni Si AI Na Sr Ti Zn Zr no. p RAW- 46-47 F A E ND G D F F E A F D E E D E E RAW- 45-47 F A E ND G D D F F E G E F E E ND E p RAW- 44-47 F A E ND G D F F E A F D E E D E E p RAW- 43-47 F A E ND G D F F E A p D E E D E E p - RAW- 4Z-47 F A E ND G D F F E G E F E D E E I p RAW- 41-47 F A E ND G D F F E G E F E D E E p RAW- 40-47 F A E ND G D F F E A F D E E D E E p RAW- 39-47 F A E G F F E B F D F E E E E p - lZ RAW- 38-47 F A E ND G F F E G D F E D E E p RAW- 37-47 F A E ND G D D F F E G D E E D E E p RAW- 36-47 F A E ND G D F F E G D E E D E E p RAW- 35-47 F A E ND G D F F E G D E E D E E p RAW- 34-47 F A E ND G D F F E G D E E D E E p RAW- 33-47 F A E ND G D F F E G D E E D E E p RAW- 3Z-47 F A E ND G D F F E G D E E D E E p - RAW- 31-47 F E ND G D F F E A G E F E D E E p RAW- 30-47 F A E ND G E F E A G E F E D E E p RAW- Z9-47 F E ND G E F E A G E F E D E E p z RAW- Z8-47 F A E ND G D E F E A G D F E D E E p RAW- 61-47 F A E ND G D F F E G D E E E E E t, l;

CONDA, IJlABO. LOT NO. 1200. Pboapbatic ahale member ol Pboepboria formatioa sampled in 300 level eaat croaacut of CoDda miae, aec. 13, T. 8 S., R. U E., Caribou CountJ, Idaho, oa weet limb ol Trail ayncliM. Beda atrilut N. 10 W., and dip 55 E. Section measured by F. C. Armatr0111, R. A. Boppin, aDd L. E. Smith and sampled by R. A. Qlllbr&Ddaen, 0. A. Payne, R. S. Saara, and R. P. Sbeldoa in July 1947. Sample analysed by U.S. Bureau ol Minea Laboratory, Albany, Oregon. Bed DO. Book deecriptioa R - "I Chert and mudatone R - 3 Limeetoae, cherty R - Z Chert, calcareoue R 1 Mudstoae, calcareoue P IU PbOIIpbate rock. ca~areoua, fos. col. no. ·U·BW-12. p -141 Mudatone, calcareoue p -140 Mudstone, calcareoua; foa. col. no. 47-BW·ll p ·139 Mudatoae, calcareoua p -138 Mudetoae, calcareoua; foa. col. no. o67·BW-10 p -137 Limeetoae, arpllaceoua: foe. col. 47-BW-9 p -136 Pboepbate rook, arlillaceoua p -135 Pboapbate rock p -llo& Mudatcae, calcareoua p -133 Phoapbate rook, caloareoua~ foa. col. no. 47-BW-8 p -132 Pboepbate rock p -131 Phoepbate roc:ll p -130 Pboepbate rook p -129 Phoapbate rock p -128 Pboepbate rock, calcareoue p ·1Z7 Pboapbate rock p -1Z6 Pboapbate root. calcareoua near baH p -125 Pboapbate rook p -124 Limeatone, phoaphatic p -123 Phoapbate rock, calcareous Rex member of Phosphoria formation--basal beds only FCA-141-47 z. 7 s.s z. 4 I 045 Phoapbatic abale member of Phosphoria formation FCA-140-47 FCA-139·47 FCA-138-47 FCA-137-47 s. 6 FCA-144·47 l.Z FCA-143·47 FCA-142.-47 s. 1 FCA-136-47 z. 1 FCA-135-47 17 FCA-134-47 o. 7 FCA-133-37 06 FCA-132.·47 14 FCA-131-47 FCA-130·47 FCA-12.9·.&7 FCA-128·.&7 FCA-1Z7-47 FCA-12.6-47 z.s 13 FCA-125·47 FCA-124-47 13. z 13. z 1 PoaU collection by B. Wedow, Paleontoloc and StraUtrapby Branch, U. S. Geolopcal Survey. Z.6 Cumulative thickness (feet) 1.&.25 1.&.80 zo.os Thickneaa x percent P20 5 l eumul.stl'fe 1 Z3.56 Z7.76 Uo&. 78 17Z. zo 21.&.3.& Z3.&. 5Z 2.&8.87 Zli8.Z3 Samplaa analyzed for eU and cbem. U by the U. S. Geological Survey Laboratory, Geochemistry and Petrology Branch. .ooz .ooz .ou .on Thickness x percent chem. U (cumulative) N

Bed I Sample 'Thickness \,JIOlU.l'-'0.1. iU&d!y,_,co "-'C'UI.J Cumulative Thickness x Ur~um content Thickness x no. Rock description (feet) P20s Al2o 3 Fe2o 3 v2os LOSS on AClCI thickness percent P 0 (percent) percent chem. U no. ignition insoluble (feet) (cumulatfvef eU Chem. U (cumulative) P -122 Mudstone and phosphate rock FCA-123-47 27ij. 73 p -121 Phosphate rock, calcareous FCA-122-47 P -120 Limestone, phosphatic FCA-121-47 IS. 6 Z2.45 p -119 Limestone, an!Jillaceous FCA-120-47 z.o p -118 Mudstone, calcareous FCA-119-47 p -117 Mudstone, calcareous FCA-118-47 311S.27 p -116 Mudstone FCA-117-47 r.) p -115 Limestone, arJillaceous FCA-116-47

p -114 Mudstone FCA-llS-47 p -113 Mudstone FCA-114-47 p -112 Limestone, phosphatic,

argillaceous FCA-111-47 26.1SO p -111 Mudstone, phosphatic, calcareous FCA-110-47 p -110 Limestone, phosphatic RAH-146-47 p -109 Limestone, phosphatic RAH-145-47 c:::t p -108 Limestone, phosphatic RAH-144-47 p -107 Limestone, phosphatic RAH-143-47

r-- p -106 Phosphate rock, argillaceous,

calcareous RAH-142-47 09 p -105 Limestone, arJillaceous RAH-141-47 p -104 Mudstone, calcareous, phosphatic RAH-140-47 4U.ISO w p -103 Mudstone, phosphatic, calcareous LES -Z43-47 liS. 9 p -102 Mudstone, calcareous LES -242-47 p -101 Mudstone LES -241-47 Z.4 --· p -100 Phosphate rock, arJillaceous, calcareous LES -240-47 p - 99 Mudstone, calcareous LES -239-47 p - 98 Mudstone, calcareous FCA-109-47 1:1.5 Z.IS , p - 97 Mudstone, calcareous, phosphatic FCA"'108-47 I, 4 . OZ5 . 01Z p - 96 Mudstone, calcareous FCA-107-47 z.o 57Z.30 p - 95 Mudstone, calcareous FCA-106-47 p - 94 Limestone FCA-105-47 . o2s , p - 93 Mudstone, calcareous FCA-104-47 ,002

p 9Z Mudstone, calcareous, phosphatic FCA-103-47 .ozs 53.·4 p - 91 Mudstone, phosphatic, calcareous FCA-102-47 p - 90 Mudstone, calcareous FCA-101-47 p - 89 Mudstone, calcareous FCA-100-47 .ooz P - 88 Phosphate rock, argillaceous, calcareous FCA- 99-47 ,002 P - 871 Mudstone FCA- 98-47 P - 86 Phosphate rock, ar&illaceous, calcareous FCA- 97-47 n. 1s

p 85 Mudstone, calcareous FCA- 96-47 n. 95 p 84 Phosphate rock. arpllaceous, calcareous LES ·238·47 20,9 ,036 p 83 Mudstone, calcareous LES -237-47 p - 82 Mudstone LES -236-47 2.Z p - 81 Limestone, argillaceous LES -235-47 z. 1 p 80 Mudstone, calcareous and phosphate rock: fos. col. no. 47-HW-7 LES -234-47 Z6.6 69Z.9Z p 79 Mudstone, calcareous LES -233-47 p - 78 Mudstone LES -232-47 z. 5 p 77 Phosphate rock, argillaceous; fos. col. no. 47-HW-6 LES -231-47 p 76 Mudstone LES -230-47 p 75 Mudstone LES -229-47 Z.3 75,0 p 74 Mudstone LES -228-47 p 73 Limestone, argillaceous LES -227-47 . ooz p 1Z Phosphate rock, argillaceous, calcareous LES -226-47 16.Z p 71 Phosphate rock and mudstone LES-225-47 Z7.3 Q p 70 Mudstone, calcareous LES -224-47 91.ie0 p - 69 Mudstone, phosphatic, calcareous LES-223-47 1Z.O 764.5Z

p - 68 Mudstone, calcareous LES -Z2Z-47 . ooz

Fp - 67 Limestone, phosphatic, argillaceous LES -221·47 3.Z Z.3 zo.o zz.o p 66 Mudstone, contains calcareous

a concretions near top LES -220-47 98.Z5 w , p - 65 Mudstone LES -Z19-47 10Z.15 .ooz , p 64 Mudstone, phosphatic, calcareous LES -218-47 p 63 Mudstone, calcareous LES -217-47 8Z3.67 . ooz P - 6Z Limestone, phosphatic, argillaceous LES -216-47 1, 05 03 Zl.3 . ooz p - 61 Mudstone, dolomitic FCA- 95-47 z. 15 46.Z . ooa p - 60 Limestone, argillaceous, phosphatic FCA94~47 l.Z Z.4 liZ. 85 p 59 Limestone, argillaceous FCA- 93-47 Z9.2 p 58 Limestone, argillaceous FCA- 92-47 117. zs p 57 Limestone, argillaceous FCA- 91-47 p 56 Limestone, argillaceous FCA- 90-47 z. 1 12Z.05 p 55 Limestone, argillaceous FCA- 89-47 . OZ5 Z8.Z Z7.Z 1Z5.55 918.Z6 . ooz p 54 Limestone, argillaceous FCA- 88-47 Z.9 5. z ,03 1Z8.45 ,003 p - 53 Dolomite, calcareous: fos. col. no. 47-HW-5 FCA- 87·47 37,5 936.Z2 p 52 Mudstone, calcareous FCA- 86-47 z. z 1Z,O 132,55 9·38. zo . ooz ,073 P - 51 Mudstone, calcareous FCA- 85-47 Z.3 z. 3 ,077 Cumulative data incomplete due to missing information. Computations start from zero after interruption.

Bed Sample Thickness Chemical analyses (percent) Cumulative DO. Rock descripUoa DO. (feet) P2o5 Al2o 3 Fe2o 3 v2o5 Loss oo AC1C1 thickness ieoitioo insoluble (feet) p - 50 Mudstooe, calcareous FCA- 86-47 139. OS p - 49 :Uudstooe, calcareous, phosphatic LES -215·47 14Z. 25 p - 48 Limestoae, arlfllaceous: foa. col. LES ·214·47 z. 1 p - 47 Mudstone, phosphatic, calcareous LES -213-47 p - 46 Mudstone, phosphatic LES-212-47 p - 45 Limestone LES -211-47 p - 44 Limestone, arlfllaceous LES -210-47 p - 43 Mudstone, phosphatic, calcareous LES-209-47 p - 42 Mudstone, phosphatic, cootaios JYPSUDl LES -208-47 p - 41 Phosphate rock LES -207-47 p - 40 Phosphate rock LES -206-47 p - 39 Mudstone, phosphatic LES-189-U Possible shear zone, beds P-31 to P-38: rock structure largely destroyed; stratiil'aphic relations aod thicknesses unct!rtain. p - 38 Mudstone, phosphatic LES -188-47 p - 37 Limestone, dolomitic, arlfllaceous LES-107-47 24,0 p - 36 Limestone, artillaceous, phosphatic LES -186-47 p - 35 Mudstone, phosphatic LES -185-47 12, 1 p - 34 Mudstoae, calcareous LES -184-47 p - 33 Limestone, arpllaceous, phosphatic LES -183-47 zo. 5 p - 32 Mudstone, phosphatic, calcareous LES-182-47 p - 31 Phosphate rock, calcareous LES -181-47 p - 30 Phosphate rock, calureous LES-180-47 p - 29 Phosphate rock, argillaceous FCA- 83-47 p - 28 Phosphate rock, calcareous FCA- 82-47 p - 27 Limestone FCA- 81-47 P - 26 Mudstone, phosphatic FCA- 80-47 p - 25 Limestone, dolomitic FCA- 79-47 p - 24 Phosphate rock FCA· 78·47 z. 7 12 p - 23 Phosphate rock FCA- 77-U z.o 26 p - 22 Phosphate rock, artillaceous, calcareous FCA- 76-47 i3 P - 21 Phosphate rock FCA- 71-47 19 'P - 20 Phosphate rock FCA- 74-47 p 19 Phosphate rock; fos. ool. no. 47-HW-3 FCA- 73-47 p - 18 Lill.lestone, phosphatic FCA 72·47 p 17 Phosphate rock. calcareous FCA- 71-47, p 16 Dolomite, phosphatic FCA- 70-47 03 !86.75 Thickness x percent P ~or rceot (cumulat e eu Chem. U 1,002.29 1,026.89 1,027.37 1, 030.97 1, 039.09 1, 045.26 1, 056.39 1, 090.-19 1,099.45 1, 110. 25 1,111.00 1, 122. 34 1, 132. oz 1, 136. 16 1, 152. 32 1, 167.79 1,189.63 1, 195.91 1, 202.87 1, 252. 27 1, 259.62 1, 270.60 1, 285.96 1, 351.71 1, 404.45 1, 447.20 1, 488.64 1, 527.06 1, 571. 38 1, 592.77 1,641.80 1, 655. 72 Thickness x percent chem. U (cumulative} . 009 --· --· --·

w N

p - 15 Phosphate rock LES ·205·47 p - 14 Phoephate rock LES-204·47 p - u Phoaphate rock LES ·203-47 o. 5 P lZ Phosphate rock. artillaceous LES -202-47 p - 11 Phosphate rock, artlllaceous LES ·201·47 p - 10 Phoaphate rock LES-200-·U o. 5 p - 9 Phosphate rock LES ·199·47 p - 8 Limestoue LES -198-47 o. 1 p - 7 Phosphate rock LES -197-47 p - 6 MudstoDe, calcareous LES -1'16-47 p - 5 Limestoae. arJillaceous LES ·195-47 p - 4 Mudstoae, calcareous LES ·194-47 p - 3 Mudstone. calcareous LES ·193-47 p - Z Mudstone. calcareous LES -19Z-47 p - 1 Phosphate rock; fos. col. no. 47·HW·Z LES-191-47 O.Z5 Wells formation Cw· 11 Limestone; fos. col. no. 47-HW-1 12 18B.l0 28 51 54 54 5,S 16 08 1. 768. Z2 1. 776. 14 1. 791.94 1. 830.94 1. 846. 1Z 1. 851. 8Z .OZ3

£3

Frt

Cumulative data incomplete due to missing information. Computations start from zero after interruption. Note incompleteness of cumulative data. w w

SPECTROGRAPHIC ANALYSES-CONDA, IDAHO. LOT NO. 1200. Semi-quantitative analyses of samples of the Phosphoria formation, Conda, Idaho (see immediately preceeding pages for location of section, thickness and description of strata, and chemieal analyses of samples), made by U. S. Bureau of Mines Laboratory, Albany, Oregon. In addition to the elements listed in the table below, Sb, As, Be, Bi, Cd, Co, Ga, Au, Li, pt, Ta, Sn, and W were looked for in all samples but were not detected. Bed Sample no. Al Ba B no. R - FCA-141-47 ND E p -142 FCA-140-47 ND F p -141 FCA-139-47 ND E p -140 FCA-139-47 ND E p -139 FCA-137-47 ND E Explanation of symbols A more than 10 percent B 5-10 percent C 1-5 percent D 0.1-1 percent Ca Cr Cb Cu Fe E ND G A E ND G D E ND G E ND G E ND G E 0.01-0.1 percent F o. 001-0.01 percent G less than 0. 001 percent ND not detected Pb Mg Mn Mo Ni ND D E F E ND D E F E ND D E F E ND D E F E ND D E F E Beds P-138 through P-136 not analyzed. p -135 FCA-136-47 ND F A E ND G D ND D E F E p -134 FCA-135-47 ND E E ND G ND D E E E p -133 FCA-134-47 D ND F A E ND G D ND D F F F p -132 FCA-133-47 D ND F A E ND G D ND D F F F p -131 FCA-132-47 E F A D ND G ND D F E E p -130 FCA-131-47 D E F A E ND G ND D F F F p -129 FCA-130-47 E F A E ND G ND D F F E p -128 FCA-129-47 E F A E ND G ND D F F F p -127 FCA-128-47 E F A E ND G ND D F F E p -126 FCA-127-47 E F A E ND G ND D F F E p -125 FCA-126-47 E F A E ND G ND D F F E p -124 FCA-125-47 E F A E ND G D ND F F F p -123 FCA-124-47 E F A E ND G D ND D F F E p -122 FCA-123-47 E E A E E G ND D F E E p -121 FCA-122-47 E F A E E G D ND D F E E p -120 FCA-121-47 D E F A E ND G D ND F F F p -119 FCA-120-47 E F A E E G ND E E E p -118 FCA-119-47 E E B E E G ND D F E E p -117 FCA-118-47 E E E E G ND D F E E p -116 FCA-117-47 E E E E G ND D F E E p -115 FCA-116-47 E E E E G ND D E E E Si Ag Na Sr Ti A ND E ND E ND E E E A G D E E A ND D ND E A ND E ND E G D E E A G D E D D G E E F D G E E F B G E E E G E E E B G E E E G E F E G E E E G E E E G E E E G E F E G E E E A G E E E B G E E E G E E E A G D E E A G D F E A G D F E A G D F E A G D F E Zn E ND D E E D D ND E E D E D D E E E E D D E E E E E ND D E D E D E E ND E E D D D E E ND D E D E D D D E D E Zr F F E F F F F F F F F F F F F F F F E F F F F F F E Ct +

p -114 FCA-115-47 E E E E G ND E E E A G D F E D E E p -113 FCA-114-47 E E E E G ND E E E A G D F E D E E p -112 FCA-111-47 E F A E E G E E E E B G D E E D E F p -111 FCA-110-47 E F B E E G ND D E E E A G D E E D E F p -110 RAH-146-47 ND F A E ND G D ND D E F F ND E E F D ND F p -109 RAH-145-47 ND F A E ND G D ND D E E E B ND E E E D E F p -108 RAH-144-47 ND F A E ND G D ND D E E E B G E E E D E F p -107 RAH-143-47 ND F A E ND G D ND D E F E B G E E E D E F p -106 RAH-142-47 ND E B E ND G ND D E F E A G D E E E E F' p -105 RAH-141-47 ND F A E ND G ND E F E A G D E E E ND F p -104 I RAH-140-47 ND E A E ND G ND D E F E A G D E E E E F

Beds P-103 through P-99 not analyzed. :; p - 98 FCA-109-47 E F E ND G E D E F E A G D F E E ND E p - 97 FCA-108-47 E F E ND G D ND D F F E B G D E E E E F , , p - 96 FCA-107-47 E F B E ND G ND D E F E A G D E E E E F

p - 95 FCA-106-47 E F E ND G ND D E F E A G D E E E E F p - 94 FCA-105-47 E F B E ND G D ND F F E G D F E E ND F p - 93 FCA-104-47 E F E ND G ND D E F E A G D E E E ND F

p - 92 FCA-103-47 E F E ND G ND D E F E A G D E E E E F Ul p - 91 FCA-102-47 E F B E ND G ND D E F E A G D E E E E F p - 90 FCA-101-47 E F E ND G ND D E F E A G D E E E ND F p - 89 FCA-100-47 E F B E ND G ND D E F E A G D E E E E F

p FCA- 99-47 E F B E ND G ND D E F E A G D E E E E F p - 87 FCA- 98-47 E F E ND G ND D E F E A G E E E E E F p FCA- 97-47 E F E ND G D ND D E F E B G E E E D E F p - 85 FCA- 96-47 E F E ND G ND D E F E A G D E E E E F p - 84 LES -238-47 E F B E ND G ND D E F E B G E E E E E F p - 83 LES -Z37-47 E F E ND G ND D E F E A G D F E E ND F p - 82 LES -Z36-47 E F E ND ND E F E A G D F E E ND E p - 81 LES ·235-47 E F E ND G ND E F E B G E F E E ND F p - 80 LES -234-47 E F B E ND G ND D E F E B G E E

E ND F p - LES-233-47 E F E ND G ND D E F E A G F E E ND E p - 78 LES -232-47 E F ND ND G ND D E F E A G D F E E ND F p - LES -231-47 E F B E ND G ND D E F E B G E E E D ND F p - LES -230-47 E F E ND G ND D E F E A G E F E E ND E p - LES -229-47 E F E ND G ND D E F E A G D F D E ND E p - 74 LES -228-47 E F E ND G ND D E F E A G D F D E ND E p - LES -227-47 E F B E ND G ND E F E A G D F E E ND E P-n LES -226-47 E F B E ND G ND D F F E B G D F E E ND F p - 71 LES -ZZS-47 E F B E ND G ND D F F E B G E F E E ND F p - 70 LES-224-47 E F F ND G ND D E F E B G D F E E ND E p - 69 LES-223-47 E F B E ND G ND D E F E B G D E E D ND E

,. Bed Sample no. Al Ba B Ca Cr Cb Cu Fe no. p - 68 LES -222-47 E F E ND G p - 67 LES -221-47 E F E ND D p - 66 LES -220-47 E F D F ND G p - LES -219-47 E F D F ND G p - 64 LES -218-47 E F E ND G D p LES -217-47 E F E ND G p - 62 LES -216-47 E F B E ND G D p FCA- 95-47 E F E ND G p FCA- 94-47 E F B E ND G p FCA- 93-47 E F B E ND G D p FCA- 92-47 E F D ND G p - 57 FCA- 91-47 E F D ND G p - 56 FCA- 90-47 E F E ND G p - FCA- 89-47 E F E ND G p - FCA- 88-47 E F E ND G p - 53 FCA- 87-47 E F B E ND G D p - FCA- 86-47 E F E ND G p FCA- 85-47 E F E ND G p FCA- 84-47 E F E ND G D p - 49 LES -215-47 E F E ND G , p - 48 LES -214-47 E F E ND G D p - 47 LES-213-47 E F E ND G p - 46 LES-Z1Z-47 E F E ND G p - 45 LES-Zll-47 ND F B F ND G D p - 44 LES -Z10-47 ND F F ND G D p - 43 LES-Z09-47 E F E ND G P - 4Z LES -Z08-47 E F B E ND G p - LES -Z07-47 E F A E ND G p - 40 LES-Z06-47 E F E ND G p - 39 LES -189-47 ND F A E ND G D p - 38 LES -188-47 ND F D ND G D p - 37 LES-187-47 ND F B E ND G D p - 36 LES -186-47 ND F E ND G D p - LES -185-47 ND F E ND G D p - 34 LES-184-47 ND F B E ND G D p - 33 LES-183-47 ND F B E ND G D P - 3Z LES -18Z-47 ND E A E ND G p - LES -181-47 ND F A E ND G D p - LES-180-47 E F A D ND G tJ - Z9 FCA- 83-47 E F B E ND G tJ - Z8 FCA- 8Z-47 D E F A E ND G Pb Mg :Mn Mo Ni Si Ag ND D E F E A G ND D E F E ND ND D E F E A ND ND D E F E A ND ND D F F E B ND ND D E F E A G ND D E F E G 111""0 D E F E A G ND D E F E A G ND D E F E B G ND D E F E A G ND D E E E A G ND D E F E B G ND D E F E G ND D E F E A G ND E F E G ND D E F E A G ND D E F E A G ND D E F E A G ND D E F E A G ND E F E B ND ND D F F E A G ND D F F E A G ND E F F ND ND F F F ND ND D F F E A G ND D F F E G ND D F F E B G ND D F F E B G ND D F F E G ND D F F E A G ND E F E G ND F F E B G ND D F F E G ND D F F E B G ND D F F E B G ND D E F E A G ND D F F E G ND D F F E B G ND D F F E B G ND D E F E G Na Sr Ti D F D D F E D ND E D ND E D ND E D F E D F E D E E D E E D E E E E E E E E D E E E E E D E E E F E D F E D F E E F E D F E E ND E E F E D F E D F E . D ND E E F E E F E E E E E F E D E E D ND E E ND E E ND E E ND E D ND E E ND E D ND D E ND E. D E D E E E E E E Zn E ND E ND E ND E ND E ND E E E E E E E E E ND E E D E E ND E E E ND E ND E ND E ND E ND E E E ND E E E E E ND E ND · E E E E D E E ND F E F F F E F E F F F E F E F E F E E E D E D ·E Zr E F E E F E F F F F F F F F F F F F E F F F F F F F F F F F F F F F F F F F F F F

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p - FCA- 81-47 D E F B E ND G D ND F F E G E F E E ND F p FCA- 80-47 E F B E ND G ND D E F E A G E E E E E E p FCA- 79-47 E p B E ND G ND E F E B G E F E E E F p FCA- 78-47 D E p B E ND G ND D F F E B G E E E D E F

p FCA- 77-47 D E F B E ND G ND D F F E B G E E E D· E F p FCA- 76-47 E F B E ND G ND E F E B G D F E D E F c-:t p - Zl FCA- 75--47 E E F E ND G D ND D F F E D G D E E E E F -- p - zo FCA- 74-47 D E F A E ND G ND E F E B G D E E D E F p FCA- 73-47 D E F B E NO G D ND D F F E G E F E D E F

p FCA- 71.-47 E F B E ND G D ND E F E B G E F E D E F p FCA- 71-47 E F B E ND G D NO D F F E G E F E D E F f-5 p FCA- 70-47 D E F B E NO G ND F F E G E F E E ND F p LES -ZOS-47 D ND F A E ND G D ND D F F E G D E E E F E p LES -1.04-47 D ND F A E ND G D ND D ND F E G D E E D F F -· p LES-1.03-47 ND F B E ND G D ND D ND F E G D E E D F F r-- P - 1Z LES-1.02 ... 47 D ND F A E ND G D ND D ND F E G D E E D E F p - LES -1.01-47 D ND F B E ND G D ND D ND F E G D E E D E F p - LES -Z00-47 D ND F B E ND G E ND D ND F E G D E E D E F p LES-199-47 D ND F A E ND G D ND D ND F E G D E E D E F (.0 p LES -198-47 D NO F B E ND G D ND F F E G E ND E E F F 'rMa'l p LES-197-47 ND F A E ND G D ND F F E G D E E D E F p - LES -196-47 ND E E ND G ND D F E E A ' G D ND D D D E p LES -195-47 ND E F ND G ND F F E A G E ND E E F E p LES-194--47 ND E D E ND G ND D F F E A G E ND D D E E p - LES-193-47 ND E F ND G D ND F F E A G E ND D E F E p z LES -191.-47 NO E E ND G ND E F E A G ND D E E I E p - LES -191-47 ND F A F ND G D ND D F F E G D E F F F F

DIAMOND DRILL HOLE 6, SLUG CREEK VALLEY, IDAHO. LOT NO. 1277. Part ol pboaphatic abale member ot Pboapboria formation cored in diamond drill hole 6 on west slope of hill above Slug Creek Valle,-, aec. SO, T. 8 S R. 44 E., Caribou County, Idaho, on west limb of Schmid syncline. Beds strike north and dip E. Hole drilled iD September 1948 by U.S. Bureau of Mines, A. E. Long in charge, and core measured and sampled by D. F. Davidson. Samples &Dalysed b7 U. S. S.reau ot MU.a J,.aboratory, Albany, Oregon. Bed Rock description Sample Thickness Cumulative Thickneaa x no. no. (feet) thickness perceat P 0 (feet) (cumulat~ef Phosphatic shale member of Phosphoria formation--lower beds only P-32 Phoaphate rock, argillaceous DFD-1111 16.1$ z. 5 P-31 Phoapbate rock, argillaceous DFD-1112 P-30 Phoaphate rock, argillaceoua DFD-1113 P-29 Phoaphate rock DFD-lllo4 P-28 Mudstcme, phoaphatic, calcareous DFD-1115 o. 7 P-27 Lime at oDe DFD-1116 P-26 Limestone DFD-1117 P·25 Phosphate rock, arJillaceoua DFD-1118 P-24 Lime atone DFD-1119 11$5.69 P-23 Limeatone, arJillaceoua, phosphatic DFD-1120 P-22 Mudstone, pboapbatic DFD-1121 P·Zl u .. stoae, argillaceous DFD-1122 P-20 Limeatooe, argillaceous DFD-1123 P-19 Lime atone DFD-1124 P·18 Phosphate rock DFD-1125 P17 Phoapbate rock DFD-1126 Phosphate rock DFD-1127 P-15 Pboapbate rock. ar,n1aceoua DFD-1128 P·l4 Limeatooe. ar,Ulaceous DFD-1129 P·U Pboepbate rock, calcareous DFD-1130 U0.88 P·U Phpbate roek DFD-1131 P·ll Pboephate rock. arJlllaceoua DFD-1132 P-10 Limestone, pboepbatic DFD-1133 9 LimeatoM, pboaphatic DFD-1134 8 Pboepbate rock DFD-1135 7 Pboepbate rock DFD-1136 P· 6 Pb011plate rock DFD-1137 Z.3 P· 5 Phoepbate rock DFD-1138 P- 4 lludatoM DFD-1139 P· 3 Limeetc:.e, arpuaceau DFD-1140 z.o P· Z Mudatone, caleareoua DFD-1141 z. 1 P· 1 Pb011plate rock DFD-1142 Sample &Dal,.sed for eU and cbem. U b7 tba U. S. Geological Survey Laboratory, Geochemistry and Petroloo Braach. Thickness x percent eU e (cumulative) -· .ooz .ou .ooz .ooz ,., !I ,

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,.. DIAMOND DRILL HOLE 3, MIDDLE SULPHUR CANYON, IDAHO. LOT NO. 1274. Part ol phosphatic shale member at Phosphoria formation cored in diamond drill hole 3 on south slope at Middle Sulphur Canyon. sec. 8, T. 9 S., R. 43 E., Caribou County, Idaho, on west limb of Trail Creek syncline. Beds strike north-northwest and dip 15 E. Hole drilled in September 1948 by U. S. Bureau ot Mines, A. E. Lone in charee. and core measured and sampled by D. F. Davidson. Samples analyzed by U.S. Bureau of Mines Laboratory, Albany, Oreeon. Bed no. P-25 P-24 P-Z3 P-Z2 P-21 P-20 P-19 P-18 P-17 P-16 P-15 P-14 P-13 P-12 P-11 P-10 P- 9 P- 8 P- 7 P- 6 P- 5 P- 4 P- 3 P- 2 P1 Sample Chemical analyses Rock description Thickness (percent) no. (feet) I Acid P2o5 insoluble Phosphatic shale member of Phosphoria formation--partial section Mudstone Mudstone Mudstone Mudstone Mudstone Mudstone, phosphatic Mudstone, phosphatic Phosphate rock, artrillaceous Phosphate rock, artrillaceous Phosphate rock, calcareous Phosphate rock Phosphate rock and mudstone Phosphate rock and mudstone Phosphate rock, areillaceou& Mudstone, phosphatic Phosphate rock, argillaceous Phosphate rock Phoaphate rock, areillaceous Mudstone, phoaphatic Core misainc Phosphate rock, areillaceous Phosphate rock Phosphate rock, areillaceous Phosphate rock, areillaceous Phosphate rock. areillaceous Core missing Phosphate rock DFD-961 DFD-962 DFD-963 DFD-964 DFD-965 DFD-966 DFD-967 DFD-968 DFD-969 DFD-970 DFD-971 DFD-97Z DFD-973 DFD-974 DFD-975 DFD-976 DFD-977 DFD-978 DFD-979 DFD-980 DFD-981 DFD-982 DFD-983 DFD-984 DFD-985 o. 7 1Z.8 Cumulative thickness (feet) Cumulative data incomplete due to missing information. Computations start from zero after interruption. Note incompleteneas of cumulative data. · Thickness x percent P ~0, (cumulat e so. 70 66.00* Z00. 57 38.88* Samples analysed for eU and chem. U by tbe U. S. Geological Survey Laboratory, Geochemistry and Petroloey Branch. Ur~ium content (percent) .u ICbem. V Thickness x percent eU (cumulative) . 18Z .019* . 008* !l rc:::

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DlAMORD DRILL BOLE 4, MIDDLE SULPHUR CANYON, IDAHO. LOT NO. 1Z75. Phoepllatia llba1e member al Pboaphoria formaUon cored ill diamond drill bole 4 oa north slope of Middle Sulphur Can;yon, aec. 8, T. 9 8., B. U J:., Caribou County, Idaho, on weat limb of Trail Creek ayacliDe. Bed atria north-northwest and dip 2z E. Hole drilled ln S.pt1..a..r 1941 by U.S. Bureau oiMiaea, A. E. LODtln char,.. ParUal aectioa measured and sampled by D. 1". Davidaoo. Sample aaalJH'I by U.S. Bureau alliltlMa Laboratory, Albany, Oreaon. Bock deacrlptloo Sample Tbickne .. CumulaUve Tbickneas X no. (feet) thickness percent p 0 (feet) (cumulait\;, PboapbaUc abale member of Pboapboria formatia&-baaal beds only :P· 8 Pboepbate rock Dl"D-986 l.Z l Pboepbate rock Dl"D987 z. 1 P· 6 Pboapbate rock. arJillaceoua Dl"D-988 Z.5 Zl.8 1Z7.76 p. 5 Pboapbate rock. arJillaceoua Dl"D-989 Z6.6 4 Pboepbate rock Dl"D-990 s. 9 S Mudatooe Dl"D-991 Z.4 P- l Mudatooe Dl"D-99Z l.Z 31:16.96 I Mudstone, pboaphaUc Dl"D-993 Wells formation Samplea analysed for eU and cbem. U by tbe U.S. Geological Slaney LaiMwatOI'J, Geochemiatry and PetrokaCJ Bruacb. Tbickneas x percent eU (cumulaUve) .oea .006 .. , .tAl .00" -· .oos

.OM Cw-1 I Limaatooe I Dl"D-994 I 0. z I z. 8 I 0. zo 0005 I -- I .r . ·

DIAMOND DRILL HOLE 5. SOUTH FORK OF JOHNSON CREEK. IDAHO. LOT NO. 1Z76. Part of pboaphatic ahale member of Phosphoria formation cored in diamond drill hole 5 in valley bottom of south fork aC Johnson Creek. aec. 9. T. 9 s .. R. 43 E Caribou County. Idaho. on east limb of Trail Creek syncline. Beds strike northwest and dip 3o SW. Bole drilled in September 1948 by U.S. Bureau of Mines. A. E. Lona in charae. and core measured and sampled by D. F. Davidson. Samples anal,.aed by U.S. Bureau of Mines Laboratory. Albany. Ore1on. Bed Sample Thickness Chemical analyses Cumulative Thickness x DO. Rock description (feet) (percent) thickness no. I Acid percent P2 0 Pz05 insoluble (feet) (cumulatlver Phosphatic shale member of Phosphoria formation--partial section P-7 Mudatone DFD 995 0. s tn.o 0. s P-6 Mudatooe. phosphatic DFD- 996 1Z.8 P-5 Mudatoae DFD- 997 l.Z z. 7 z. 7 P-4 Mudatone DFD- 998 Z.3 s. 0 32. lZ P-3 Mudatone DFD-1098 P·Z Mudatone DFD-1099 Z.8 5Z.99 Core misaiq 9.d P-1 Mudatone and phoaphatic mudstone DFD-1 : 10 z. 1 Z4. Note incompletena .. ot cumulative data. Samples analyzed for e11 and cbem. U by tbe U. S. Geological Survey Laboratory. Geochemistry and Petrolology Branch. Ur~um content [percent) Thickness x percent eU eU IChem. U (cumulative) . ooz . ooz . ozs

:.- ,

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NORTH DAIRY, IDAHO. LOT NO. 1ZU. Upper part~ phosphatic abale member ot Phosphoria formation sampled in bulldozer trench near north end d Dairy ayocliae, NEtNEt aec:. zo. T. 9 8., R. 44 E., Caribou .County, Idaho. Tbe atratlaraphic sequence of tbe unite is questionable for, because ala larp aumber at faults, some beda may be omitted or repeated. No cumulative totals are pven for this reason. Section measured by R. M. Campbell and L. E. Smith and sampled by R. S. Sears, R. P. Sheldon, and R. A. Smart in Au1uat and September 194 7. Samples analyzed for P 20tand acid insoluble by U.S. Bureau ol Mines LaboratOJ'1, Albany, Ore1on, and for other constituents by Trace Elements Section aboratory, U. S. Qeolopcal Survey, Waahin,ton, D. C. Bed Rock cle8cripttoo Sample DO. no. Re:a member ot Phosphoria formatioD-basal bed only Samplea analyzed for eU and cllem. U by the U. 8. Geoloalcal Survey LaboratoJ'1, Geochemistry aad PetrolOCT Branch. R- 1 l:_bert I LES-400-47 I 6. z I -- Phoaphatic shale member ot Phosphoria formation-upper part only P-61 Phosphate rock LES-399-47 1Z.9 .Olf P-60 MudstoDB LBS-398-47 P-59 MudstODB LES-397-47 .ooz P-58 Mudstone LES-396-47 z.o P-57 Mudstone LES-395-47 l.Z 1. z .ooz P-56 MudstoDB LES-394-47 .00!5 P-55 MudatODB LES-393-47 P-54 MudstoDB LES-391-47 6.Z .ON P-53 MudatODB LES-391-47 z.z P-!52 Phosphate rock, arpllaceous LES-390-47 Z6.6 ,008 P-51 Mudstaae LES-389-47 .OM P-50 lludstooe LES-388-47 .ooz .GOO Senral beds m&J be miasinl in fault aoae between LES-388-47 and RMC-!50-47. P-69 Phosphate rock RMC- 50-47 34.Z 4.Z6 P-48 Mudatooe and phosphatic mudstone RMC- 49 -47 59.Z P-47 Pboaphate rock and mudatoDB RMC-41-47 Z7.Z ZZ.8 P-46 MudatOM RMC-47-47 69.Z .oos P-45 Phosphate rook RIIC- 46-47 4.U 1Z.8 P-44 Phosphate rock, arJlllaceoua RIIC- 45 .. 47 !5.9Z P-43 Phosphate rock RMC- 44-47 Z8.7 Z.l 0. 9Z P-4Z MudstODB, pbocpllatto RIIC-43-47 l.Z lZ. 5 Z.56 6.ZO P-41 Phosphate rook RMC- U-47 3Z.7 P-40 Phoaphate roll, arpllaceous RMC- 41-47 Z4.4 1. Z9 Z5.6 .01o1 Phosphate rock RMC-40-47 Z6.Z z.o 1. lZ 18.Z .ou , -:· c .. J

Bed Sample Thickneaa

Uranium content (percent) no. Rock description no. (feet) Pzo5 Al2o 3 Fe2o 3 Loss on Acid ignition insoluble eU Chem. U P-38 Phosphate rock and phosphatic mudstone RMC- 39-47 P-37 Mudstone RMC- 38-47 P-36 Mudstone, phosphatic RMC- 37-47 5.!12 P-35 Phosphate rock, arlillaceous RMC- 36-47 P-34 Mudstone, phosphatic RMC- 35-47 9. 7Z . ooz P-33 Mudstone, calcareous and phosphate rock RMC- 34-47 Z.4 3!1.8 . 00!1 P-32 Mudstone RMC- 33-47 P-31 Mudstone, phosphatic, calcareous RMC- 32.-47 z. 10 P-30 Phosphate rock and phosphatic mudstone RMC- 31-47 P-2.9 Phosphate rock and phosphatic mudstone RMC- 30-47 P-28 Phosphate rock RMC- 2.9-47 3Z. 3 P-2.7 Phosphate rock, contains chert lena RMC- 28-47 P-26 Phosphate rock and ar1illaceous phosphate rock RMC- 27-47

P-25 Phosphate rock and ar11llaceous phosphate rock RMC- 26-47 P-2.4 Phosphate rock and argillaceous phosphate rock RMC- 2.5-47 P-23 Phosphate rock RMC- 24-47 P-ZZ Phosphate rock RMC- 2.3-47 Fault zone, correlation not positive.

P-Zl MudstoO. LES-387-47 P-ZO P'bosphate rock and mudstone Sample lost P-19 Mudstone, phosphatic LES-385-47 P-18 Mudstone, phosphatic LES-384-47 P-17 Mudstone, phosphatic LES-3tS3-47 P-16 Mudstone, phosphatic LES-382.-47 P-15 Phosphate rock, arlillaceous LES-381-47 zo. 1 P-14 Mudstone, phosphatic LES-380-47 P-13 Mudstone and phosphate rock LES-379-47 P-1Z Mudstone, phosphatic LES-378-47 P-11 Mudstone LES-377-47 P-10 Mudstone, phosphatic LES-376-47 P- 9 Mudstone, phosphatic LES-375-41 o.s P- 8 Mudstooe LES-374-47 .OOl 7 Mudatooe LES-373-47 6 Mudstooe LES-37Z-47 P- 5 Mudatone LES-371-47 P- 4 Uudetooe. pbospbatic LES-370-47

·' P- 3 P- Z P- 1 Mudatoae, chert. and phosphate rock Mudstone, containa inert nodul.ea Mudatoae, coatalna chert nodule Sample lost LES-368-47 LES-367-47 Z.4 Z.4 !1 ,

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SWAN LAKE GULCH, IDAHO. LOT NO. 1265. Phosphatic shale member and part of Rex member of Phosphoria formation sampled in bulldozer trench 1n Swan Lake gulch, NEiswi sec. 29, T. 9 S., R. 43 E., Caribou County, Idaho, on west limb of faulted and contorted syncline. Beds of Rex member strike N. 46 W. and dip 54 E. Section measured by F. W. CJI Malley, R. P. Sheldon, and R. G. Waring and sampled by Waring and H. A. Larsen in September 1948. Samples -analyzed for P 20..5 and acid insoluble by U.S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements Section Laboratory, U.S. Georogical Survey, Washiqtoo, D. C. Bed no. Rock description Rex member of Phosphoria formation--basal beds only R- 8 Chert WOM-3011 R- 7 Limestone, argillaceous WOM-3020 o. 3 R- 6 Chert, calcareous WOM-3019 R- s Chert, calcareous and limestone WOM-3018 o. 6 R- 4 Limestone, argillaceous WOM-3017 1. s R- 3 Chert WOM-3016 o. s R- 2 Chert, calcareous WOM-3015 o.s R- 1 Chert, calcareous WOM-3014 o. 7 Phosphatic shale member of Phosphoria formation P-97 Phosphate rock, argillaceous, calcareous; fos. col. no. 48-JES-Z431 WOM-3013 P-96 Mudstone, calcareous WOM-301Z 1. z I. S P-95 Mudstone, calcareous RGW- 3010 P-94 Mudstone; fos. col. no. 48- JES-Z4Z RGW 3009 z.o P-93 Mudstone, calcareous; fos. col. no. 48-JES-241 RGW- 3008 P-92 Mudstone, calcareous; fos. col. no. 48-JES-240 RGW-3007 I. S P-91 Limestone RGW-3006 o. 7 P-90 Mudstone, calcareous; fos. col. no. 48-JES-239 RGW- 3005 3. s P-89 Mudstone, calcareous; fos. col. no. 48-JES-238 RGW- 3004 z.z 3.Z P-88 Mudstone RGW- 3003 P-87 Mudstone, phosphatic RGW-3002 P-86 Limestone, phosphatic RGW- 3001 P-85 Limestone, argillaceous RPS- Z850 P-84 Phosphate rock RPS- Z849 P-83 Phosphate rock, argillaceous, calcareous RPS- Z848 Z0.9 P-82 Mudstone, phosphatic; fos. col. no. 48-JES-237 I WOM-3000 I I 15.8 I -- n. 1 Cumulative thickness 12.Z zo.s z. 1 3. z s. 2 10.Z zz.o Thickness x percent P 2 0 5 {cumulatiVe] Z.99 Z9.99 so. 35 6Z.74 117. oz Samples analyzed for eU and chem. U by the U. S. Geological Survey Laboratory, Geochemistry and Petrology Branch. . ooz . ooz

Thickness x percent eU (cumulative) .oos . OZ6 .OZ6 , , ,

r ·

P-81 Mudstone. calcareous, phosphatic; foa. col. no. 48-JES-236 WOM-2999 P-80 Phosphate rock. calcareous WOM-2998 Limestone concretion WO:U-2973 (0.4) o. 7 P-79 Phosphate rock, calcareous WOM-2997 P-78 Limestone, phosphatic; fos. col. no. 41-JEB-235 WOM-2996 P-77~ Limestone, phosphatic; fos. col. n'O. 48JES-234 WOII-2995 P-76 Phosphate rock. calcareous, arJillaceoua;

fos. col. no. 48-JES-233 RPS- 2847 Limestone concretion RPS 2846 P-75 Mudstone, phosphatic; fos. col. no. 48-JES-232 RPS- 2845 , P-74 Mudstone RPS- 2844 P-73 llwiatone and argillaoeous phosphatE.

rock RPS- 2843 P-72 Mudstone; fos. col. no. 48-JES-231 RPS- 2842 P-71 Mudstone, phosphatic RPS- 2841 o.s P-70 Mudstone RPS- 2840 Phosphate rock. arJillaceous RPS 2839 P-68 Mudstone RPS- 2838

P-67 Mudstone, phosphatic WOII-2994 P-66 Mudstone WOII-2993 P-65 Mudstone WOM-2992 s. 5 P-64 Phosphate rock WOM-2991 .oos P·b3 Mudstone; fos. col. no. 48-JES-230 WOM-2990 J P-62 Phosphate rock. arlf.llaceous WOII-2989 e..;r·:i P-61 Mudstone WO:U-2988 P-60 Phosphate rock. argillaceous and mudstone WOM-2987 Mudstone WOM-2986 P-58 Mudstone, phosphatic WOM-2985 P-57 Mudstone WCM-2984 . ooz P-56 Mudstone, phosphatic WOM2983 P-55 Mudstone WOII2982 85.& P-54 Mudstone; fos. col. no. 48-JES-229 WOM-2981 P-53 Phosphate rock, argillaceous WOM-2980 P-52 Mudstone WOM-2979 P-51 Mudstone WOM-2978 P-50 Mudstone WOM-2977 P-49 Mudstone; fos. col. no. 48-JES-228 WOM-2976 P-48 Mudstone WOM-2975 1 :rosail collection made by J. E. Smedley, Paleontology and StratiJraphy Branch, U. S. GeoloJical Survey.

Bed p p p p p p p p p p p p p p p p no. -4Z -3Z -Z9 -Z8 -Z7 -Z6 -z5 -Z4 -Z3 -zz -Z1 -zo -lZ Rock description Mudstone Phosphate rock, argillaceous Mudstone; fos. col. no. 48-JES-ZZ7 Mudstone, phosphatic Mudstone; fos. col. no. 4()-JES-ZZ6 Phosphate rock, argillaceous Phosphate rock Mudstone Mudstone Mudstone; fos. col. no. 48-JES-ZZ5 Mudstone Phosphate rock, argillaceous Mudstone Phosphate rock, argillaceous Mudstone; fos. col. no. 48-JES-ZZ4 Phosphate roek and mudstone Mudstone; fos, col. no. 48-JES-ZZ3 Mudstone, phosphatic, calcareous Mudstone Mudstone Mudstone Mudstone Phosphate rock, argillaceous, calcareous Mudstone, calcareous Mudstone, phosphatic, calcareous Phosphate rock, calcareous, argillaceous Mudstone, phosphatic Phosphate rock Phosphate rock, argillaceous Limestone Mudstone, phosphatic, calcareous Limestone, argillaceous Limestone, phosphatic, argillaceous Phosphate rock, argillaceous Phosphate rock, argillaceous Phosphate rock, argillaceous Phosphate rock Phosphate rock, argillaceous Mudstone; fos, col. no. 48-JES-ZZZ Phoaphate rock, argillaceous; fos. c.ol. no. 48-.JES-ZZl Sample Thickness (feet) no. WOM-Z974 WOM-Z97Z 1, 7 WOM-Z971 5,0 WOM-Z970 WOM-Z969 z.o WOM-Z968 0,7 WOM-Z967 WOM-Z966 WOM-Z965 WOM-Z964 WOM-Z963 WOM-Z96Z 0,5 WOM-Z961 WOM-Z960 0,5 WOM-Z959 WOM-Z958 0,7 WOM-Z957 0,8 WOM-Z956 Z,4 WOM-Z955 WOM-Z954 WOM-Z953 WOM-Z95Z WOM-Z951 0,4 WOM-Z950 WOM-Z949 3,0 WOM-Z948 z. 5 WOM-Z947 0,6 WOM-Z946 z.6 WOM-Z945 1,0 WOM-Z944 z.o WOM-Z943 Z,3 WOM-Z94Z z. 1 WOM-Z941 0,4 WOM-Z940 z.9 WOM-Z939 WOM-Z938 0,7 WOM-Z937 WOM-Z936 WOM-Z935 0,3 WOMZ934 Chenricalanalyses (percent) PzOs Alzo3 Fezo3 LOSS on Acid ignition insoluble 0,4 Z0.3 8, 1 71,0 3,0 76. z 18,8 37,3 Z7.7 1. z 1, 0 4.Z 77,0 z. 1 87,8 zz. 1 4.Z 74,1 Z5.3 Z4.9 l.Z 86,5 Z1, 3 Z,6 8Z,7 3,Z 75,9 3,3 83,3 68,9 31,7 4Z.O Zl. 4 Zl.3 4Z,3 Z6,7 17,4 35. z z.8 lZ,O Zl,6 zo.o Z5.6 z. 1 Zl. 7 19,0 7. zo Z1,35 z.6 5.9Z 3"-6 Z7.6 z. 7 Z5. 6 z. 5 9.0Z ZO.B 3,0 z.8 77,8 ZZ.3 Z8.5 Cumulative Thickness x thickness percent P 0 (feet) cumulative f 87,1 731,45 9Z.l 738,45 93.Z 95. z 766,5Z 101,6 104,6 818,79 8Z9.84 114.Z 114,7 86Z.Z3 864.Z7 881. Z6 1Z0,3 916,06 1ZZ. 1 9Zl. 8Z 1ZZ.8 9Z4. 13 1Z3. 6 9Z5. 33 1Z4.6 930.Z3 1Z5. 0 1Z6. 1 944,16 1Z9,1 1, 037. 86 13Z. Z 1, 045,84 1, 115. Z6 1,13Z,66 1, 138, Z6 140,1 1, 165. 86 14Z,Z 1, 169.01 14Z.6 1, 173.69 1,Z47.93 146,5 1, Z66. 93 147.Z 1, Z81. 87 1,317,75 149,5 1, 343. 35 149,8 1,344.Z5 151, 1 1,373.Z4 Ura~ium eo~tent (percent eU Chem. U .ooz ,004 . ooz ,003 ,003 ,004 .ooz ,004 ,ooz ,003 ,005 .ooz .ooz ,005 ,003 ,005 ,003 ,005 ,003 ,008 ,006 ThlcJDiess x percent eU (cumulative) ,364 .4Zl .4Z3 .4Z7 .43Z ,441 ,449 .45Z ,486 e

;-

c::.l 'illiiiO

w

P- 7 Phosphate rock, argillaceous; fos, col. no. 48-JES-2.2.0 WOM-2.933 2.5, 1 2.,8 p.. 6 Phosphate rock WOM-2.932. 33,0 1, 2. 0,63 7, 38 P- 5 Phosphate rock WOM-2.931 3,6 33,7 0,81 7,92. P- 4 Phosphate rock; fos. col. no. 48-JES-2.19 WOM-2.890 P- 3 Mudstone, calcareous, phosphatic WOM-Z889 P2. Mudstone WOM-2.874 3,9 P- 1 Phosphate rock WOM-Z873 o.z 3Z.8 Wells formation Cw-1 I Limestone; fos. col. no, 48-JES-2.18 1, 398.34 1,461,04 1, 582.. 36 18, 1 1, 619.46 53,5 160,5 1,63Z.Zl 66,7 1, 635. 72. 1, 64Z. Z8 2.,40 ,004

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DEI!R CREEK. IDAHO. LOT NO. 1Z68. Phosphatic shale member of Phosphoria formation sampled in Trench I (hand trench) on north side Of Deer Creek, sbwi sec. lt, T. 9 S., R. ·U E Caribou County, Jdabo. Section measured and partially sampled by C. F. Deiss in 1944. Unsampled part of section remeasured by R. P. Sheldon and aamplQd by R. G. Waring in 1948. All I series samples analyzed by Tennessee Valley Authority. All RPS .. rtes aamples analysed by U.S. Bureau of Mines Laboratory. Albany, Oregon. ·

Rock description Sample Thickness Chemical analyses Cumulative Thickness x (percent) DO. (feet) thickness percent P~f PzOs insoluble (feet) (cumulat Phosphatic shale mQmber of Phosphoria formation P·8Z Phosphate rock, calcareous Z4.1 7.Z3 P-81 Mudatooe, calcareous RPS-Z837 z. 1 P-SO Mudatcne, phosphatic RPS-Z836 s. z z. 1 P·79 Mudstone, calcareous RPS-Z835 z.o P-78 lludetone, calcareoua RPS-Z834 P·'l7 Mudstone, calcareous RPS-Z833 19.Z7 P-76 lludataae, calcareous RPS-Z83Z Z.3 Z9.6Z P-75 Limestone RPS·Z831 Z.3 P·74 Mudstone and phosphate rock RPS-Z830 6Z.Z P-73 Mudatcne RPS·Z8Z9 Phoepbate rock RPS-ZSZ8 Z7.4 11. z P-71 Mudstone, calcareous RPS-Z8Z7 Z3.7 RP8·ZIZ7 throup RPSZU7 equivalent to Deiss' unit nos. 69 through 73. P-70 Phoaphate rock 56·1 Z4. 5 P-69 Phosphate rock Z5.8 P-68 MudatoDe, phosphatic 54·1 Z6.6 P-67 Limestone P-66 PhMphate rock aDd mudetane 53·1 Z.3 Zl.B S0.5 P-65 Phosphate rock 51·1 P-64 Ph011phate rock aDd mudatoae P·6S Pboapbate rock 50·1 P6Z Phosphate rock 49·1 z.o 36'.3 Phosphate rock. contatna limestone nodules 48·1 z.s ZO.l Z88.39 P-60 Phosphate rock Z5.4 lZ. 5 S77.Z9 P-59 Phosphate rock, ccntaina limestone nodules S.8 Z9.6 P-51 Limeatoae, arglllaceoua 45·1 !.3 451. az P-57 Phoephate rock aed mudatOPe '4-1 lZ.Z 480. Zl P-56 Mudstone, phosphaUc 43·1 4.Z P-55 Phoepbate rock zs.o P-54 Mudatc Phosphat& rock. arpllaceona 40·1 Z4.Z 2Z.8 Samples aualyaed for eU and cham. U b7 tbe U.S. Geological Survey Laboratory. Geochemietry aDd Petrol.,. Brauch. Z Uranium coateJlt (percent) eu ICMm.v .ooz .ooz .00! ·- ·- -· ·- -· ra-

l"'PP. G

P·51111udatone, pboapbaUc 39·1 Z.4 606. J9 P·Sl Limestone RPS-Z8Z6 1Z.O RPS-2116 eq11meat to Dei .. uatt no. 49. P-50 lladatoae, ealcareoua 31·1 ·- -· P-49 Mudstone, phoapbate rock, ud lliDeMc:loe 37·1 ·- P-48 Mudstone -· P·47 Mudatooe , P46 lludatoae Z.7 Z.6 70.Z PU Phosphate rock and mudatoae u.s P-44 Phoapbate rock ud mudatone 3Z-I l.Z 2Z.6 P·43 lludatone Jl-1 Z.4 P·U Phoapbate rock and mudstone l.Z , , P-41 Mudstone aDd phosphate rock 58.Z P-40 Limestone aDd mudetaoe, pbo.phatic

P·39 Limestone ·- ·-

P-38 llud8toae, limeatxme, and ~plate rock ·- r-- P-37 lludatoae, phosphate 1"001::, aod limestone Z6·1 -· P-36 Mudatoae, pbospbauc and limestone Z5-l -· t-·J.· P-35 Limeatoae RPS-Z8Z5 o. 1 RPS·ZIZS equivalent to Deiss' unit no. 33. P34 Mudatoae, calcareous Z4·1 z.o P-n Muds._, pboapbaUe 13·1 z.o IJ., 103,59

Rps-2116

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BP81114 eqlliftlnt to Delea1 Wilt DO. J~. P·ll lludatoae z.o P-30 u ... atoae 21·1 PH lludatoae 20·1 UmeatOM ccacretlaa RPS·21ZS (0. 6) ·- RPI-1113 .. ulftleat to Del.aa' unit no. Z6. Concnt1oo ocean betw .. n Deias-Z5 and DeiaaZT, BPS-21ZZ I (1. 1) RPI-1811 ocnra wttbiD Delaa1 lllllt no. ZS. 1 Tbe full HGUoa wa measured bat onl7 part ol tbe aectlon waa sampled b7 Deiss. Tbe I Mries sample data here listed an 2 Tbe samples labelled I ere collected taken from tabla 9, p. 91 ol Delu' report. The beda not sampled b7 an I.Dc1uded in the collUDD&r .. cuon for Trench I previous to tbe present stud7 and are (u shown on plate 6 &ad 1 of Deiss report) aDd are there identified b7 unit number which do not correspond to tbe sample oot available for uranium analJals. DIUilbers ol table 9. Tbe beds NIDpled b7 Sheldoa (RPS aeries) are correlated with tbe unit number of Deisa. data baeomplete due to lllisalq Information. Computations start from aero alter interruption.

Chemical analyses Bed Rock ducription Sample Thickness (percent) no. no. (feet) Acid P20s insoluble P-28 Mudstone P·Z1 Mudstone, phosphatic and limestone P-26 Limestone RPS-2821 RPS-2821 equivalent to Deiss' unit no. 23. P-25 Phosphate rock, argillaceous and limestone Limestone concretion? RPS-2819 (1. 2) RPS-2819 eqtvalent to Deiss' unit no. 21 and occurs between RPS-2820 and Deiss-22. P-24 Phosphate rock and calcareous mudstone RPS-2820 P-23 Mudstone, phosphatic and limestone P-22 Limestone RPS-2818 RPS-Z818 equivalent to Deiss' unit no. 19. P-Zl Mudstone, phosphatic P-20 Phoapnate rock, calcareous, argillaceous P-19 Phosphate rock, calcareous P-18 Phosphate rock,and mudstone P-17 Phosphate rock and mudstone P-16 Limestone, argillaceous s. 1 P-15 Mudstone, calcareous, phosphatic P-14 Limestone, argillaceous RPS-28lt RPS-2812 equivalent to Deiss' unit no. 11. P-13 Phosphate rock and mudstone P-12 PhosphatP ~"OCk. mudstone, and limestone P-11 PIU~apaate rock and mudstone Limestone concretion RPS-2811 (0. 6) RPS-2811 concretion occurs within RPS-2810. P-10 Phosphate rock and calcareous mudstone RPS-2810 P· 9 Limestone RPS-2809 RPS-2809 and RPS-2810 equivalent to Deiss' unit no. 7. P· 8 Phosphate rock, argillaceous 5·1 P· 7 Limestone RPS-2808 RPS-2808 equivalent to Deiss' unit no. S. P- 6 Phosphate rock Cumulative Thickness x thickness percent P 0 (feet) ( cumulat~e r 211.7Z 27Z. 35 1, 003. OS Uranium content eU Cbem. U ( j ,

P· 5 Phoepbate rock l.Z 3Z. 1 P· t Pboepbate rock ·- J lludtoae 1·1 Z.9 P· I Llmetone, araillaceou RPS-Z807 P· 1 Pboepbate rock RPS-Z806 31. z Wells formation LiiDetone RPS-2817 c ... Pbupbate rock RPS-2816 c ... s Limetoae RPS-2815 c ... z Pboepbate rock RPS-Z814 CW"'1 Llmeatoae RPS-2813 " Note iacompletene .. ol cumulative data. Q 177.Z 4.Z 12,0 1,105.77 I J 1, 155. Z7 1, 157.88 1, 158.93 .OIS J0.90 (.Y:l . w