Geologic map of the Gold Hill quadrangle, Boulder County, Colorado
Geologic map of the Gold Hill quadrangle, Boulder County, Colorado by Gable, Dolores J. (1980). Full text and reference in the Mountain Man Mining Library.
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY GEOLOGIC MAP OF THE GOLD HILL QUADRANGLE, BOULDER COUNTY, COLORADO By Dolores J. Gable GEOLOGIC QUADRANGLE MAP PubJJshed by the U.S. Geological Survey, 1980 G
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GEOLOGIC MAP SYMBOLS COMMONLY USED ON MAPS OF THE UNITED STATES GEOLOGICAL SURVEY (Special symbols are shown in explanation) Contact-Dashed where approximately located; short dashed where inferred; dotted where concealed Contact-Showing dip; well exposed at triangle Fault-Dashed where approximately located; short dashed where inferred; dotted where concealed Fault, showing dip-Ball and bar on downthrown side , , Normal fault-Hachured on downthrown side Fault-Showing relative horizontal movement Thrust fault-Sawteeth on upper plate
Anticline-Showing direction of plunge; --E--+60 dashed where approximately located; dotted where concealed Asymmetric anticline-Short arrow indicates steeper limb Overturned anticline-Showing direction of dip of limbs Syncline-Showing direction of plunge; dashed where approximately located; dotted where concealed Asymmetric syncline-Short arrow indicates steeper limb Overturned syncline-Showing direction of dip of limbs Monocline-Showing direction of plunge of axis Minor anticline-Showing plunge of axis Minor syncline-Showing plunge of axis Strike and dip of beds-Ball indicates top of beds known from sedimentary structures e Horizontal -+-Vertical -J!. Overturned Strike and dip of foliation !1!._ Inclined -+-Vertical +Horizontal Strike and dip of cleavage
Inclined Vertical + Horizontal Bearing and plunge of lineation Vertical - Horizontal Strike and dip of joints --- Vertical + Horizontal Note: Planar symbols (strike and dip of beds, foliation or schistosity, and cleavage) may be combined with linear symbols to record data observed at same locality by superimposed symbols at point of observation. Coexisting planar symbols are shown intersecting at point of observation. Shafts Vertical Inclined Adit, tunnel, or slope >-Accessible >+-Inaccessible X Prospect Quarry ~Active Gravel pit X Active Oil wells o Drilling ~Abandoned X Abandoned Q Shut-in -¢- Dry hole, abandoned ~Show of gas Show of oil