Geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina

Horton,, J. Wright Jr.-, Peper, John D., Burton, William C.- bburton@usgs.gov, Weems, Robert E.- rweems@usgs.gov · 2022 · Report

This 1:100,000-scale geologic map of the South Boston 30 ’ × 60 ’ quadrangle, Virginia and North Carolina, provides geologic information for the Piedmont

This 2022 document, Geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina, is preserved in the Mountain Man Mining Library for research and reference. Original source: pubs.usgs.gov.

BUFFALO PLUTON SCOTTSBURG BASIN RANDOLPH BASIN CLOVER SHEAR ZONE RED OAK PLUTON STONES MILL PLUTON NORTH VIEW PLUTON LAKE GORDON MYLONITE ZONE NUTBUSH CREEK MYLONITE ZONE SOUTH HILL PLUTON BUGGS ISLAND PLUTON WISE PLUTON VANCE PLUTON ROANOKE CREEK BASIN NORTH FORK ANTICLINE VIRGILINA SYNCLINORIUM DRYBURG SYNCLINE LAWSONS CREEK ANTIFORM ANTICLINE SIDDON SHINY ROCK OCCONEECHEE ISLAND ANTICLINE CREEK SYNCLINE VERNON HILL ANTIFORM NATHALIE HYCO SHEAR ZONE SYN N E SIDDON ANTICLINE DRYBURG FAULT GRASSY CREEK IN CON T AC T TH RUST SYN CLINE ROANOKE CREEK ZONE FA ULT ORM SYN F CLOVER SHEAR ZONE Cu a a W a a a a a a a s Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qp2 Qal Qal Qal Qal Qal Np1 Qal Qal Qal Qp2 Qp2 Np1 Qal Qal Qal Qal Qal Qal Qp2 Qp2 Qp3 Qp2 QNr Qal Qco Qal Qp2 Np1 Qp3 Qal Qp2 Qp2 Qal Qco Qp2 Qp2 Qp3 Np1 Qal Qp3 af Qal Qal Qp3 Qal af Qp3 Qal Np1 Qal Qal Qal Qp3 Qal Qal Qal Np1 Np1 Qp3 Qp2 Qp2 Qal Qp3 Qp2 Qco Qp3 Qp2 Np1 Qal Qco Np1 Qco Qp3 Qp2 Qco Qal Np1 Np1 Qal Qal Qp3 Qal Qal Qp3 Qal Qp3 Qal Qp2 Qp2 Np1 Qp3 Qp3 Np1 Np1 Qp3 Qp2 Qal Qal Qp2 Qp2 Qp2 Np1 Qp3 Qal Qal Qp2 Qal Qal Qp3 Qp3 Qal Qp3 Qal Qal Qal Qal Qal Qal Np1 Qal Qp2 Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal QNr Qal Qal Qal Qal Qp3 Qp2 Qal Qp2 Qp3 Qal Qal Qp2 Qal Qal Qp3 Qal Qal Qal Qp3 Np1 Qp3 Qal Qp2 Qp2 Nm Nm Qp2 Qal Qal Qp2 Nm Nm Qal Qal Qal Qal Qal Qp2 Qal Nm Qal Np1 Qal Qco Qal Qp2 Qp3 Qp3 Qp2 Qp2 Np1 QNr Qp3 Qp2 Qp2 Qp3 Qp2 Qp3 Qal Qal Qal Qal Qal Qco af Qal Qal Qal Qal Qal af Np1 Qp3 Qal Qal Qal Qal Qal Qal Qal Qp2 Qp3 Qp3 Np1 QNr QNr QNr QNr QNr Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Qal Zvto Zhq Zhpm Zrmn Zhg mg Zgh Zhd Zhm Zrss Zhb Mgf Mgy Mgy Zhar Zvto J sb Zgb Zmt Zrbg Zvbm Zhb Zab mg Zrhg Zhf Zrbg Zhl Zhl Zhl Zrss Zhq Zrss Zap Zhb Zt Mgf Zvh Zcl Db Zhf mg Zhq bi Zrss Zrag Zap Zap Zhf Zmt Zg Zrss Zf grb mg Zhmm Zrss mg Zhc Zhc Zhc Zrhg Zhc Zp Zvh Zrmn Zas Zmt Zhf PMg Zhq Zmt Zvb Zap Zrbmg Zvs Zg Zrms Zap Zvb fb Zhl P w Zm Zac Zhd Zrbmg gmg gmg gmg mg Zas Zrms Zrag Zac Zhf Zbg mg Za Zas Zhf PMps PMps Zrbg Zt Zrhg Zf Zrbmg Zrbmg Zrbmg Zhcs Zhcs Zag Zrss Zmt Zvgs mg Omm Zhb Zhg Zhq P gr Zac Zrms Zhl Zhl Zp Zrhg Zbg Zhc Zbg Zrms Zcl Zvgs Zhf Zhf Zhc Zvg Zm Zrbmg Zhf Zgh Zhc Zgb mg Zhb Zbg Zhb Zrbg mg Zhb Zrss Zrhg Zbg Zbg Omm Zgh Zhb Zhb Zvgs Zhb Zhc Zhs Zhl Zcm Zrms Zhb Zhc Zhb P gr Zvgs Zgh Zapv Zrms Zag Zhvb Zag Zcm P gm Zg Zrbg Zbg Zrbg Zhb Zhb P gr Zd Zgh Db Zrbg Zm P gm mg Zgh Zasg Zas Zd Zm Zhf Zhd Db PMps Zrms Zgp grb PMmgs Zhd mg Zt Zrbg Zac Zac Zm Zm cm Zrbmg Db Zgp Zhl Zhl Zhl Zhl Zhl PMps grb sis sis Zag Zrbgm Zgl Zhf P sh Zf Zm Zvb Zhl PMmgs Mgf Zhc grb P gm sc sc Zag Zag Zhf Zac cm DSto PMps grb Zhc Mgf Zrss Omf Mgf Zhph Zhf Zrsg Zac DShd PMps Zbg Zhf Zd Osgr bg PMps Zrq Zvs Zhc Zapv Omi Zf Zhv Zhst Zhv Zgd Zf Zto bim Zhc Zhst Zvg Zdg Zf Zvg PMps DShd Zhst Zrss Zrss Zto Zto Zp Zq Omf Omf Za bim Zvg Zrbg Zmyv Zgnv Zag Zf Za Zhst Zp Mgn Mgn Zvg Zgh Zdg Zhc Zhf Zhf P sm Zhc Zhc Zhst Zto bg Omf bim Omg Zvg Omp Zf Zbgr Zhst Omp Za Zdg Zrms Mgh Zvg Zdg PMmgs Zhc Mgn DSto sc Zg Zhst Zvg cm Zvg Zqd Zhg Zks PMpu Zdg Mgh Zhst Zrbg Zrbg Zac Zhf Zac Omp PMmgs Zac Zac Zhfm Zhg Za Zmyv Mro Zdg Zrms Omu Zf J sb Zhv Omp Zhph Zrbg Zhst Zdg Zhqz Zag Zhg bi Zclg Omp Oml Omp Zhst Omu Zgn Omu J sb cm Mgn Zbgr Zg Omc Omi Zrms Omu Zhfm Zaps Zag Za Zvg Za Zgd Zhf Zbgr Zto Zhph Zto Zg Zf Zms P gl P gl P gl Zkg Zrhg gg Zrbmg Zhf bmg Omu Omu Za Zap Zag Mqw Omb Omb Omb Omb Omb Omf Omh Omh Zcc Zclg Omc Omc Omc Omc ­Zbg bim Zrms Zt Zrbg Zrhg Zrhg gmg PMps bi PMps P gm P gm Zrbg Zrms Zrbgm Zhfa Zhfa Zcc Zcc Oml Oml Oml Omf Omh Omb Omc Omc Omc Omc Zcc Zhf Zhf Zhf Zhf Zclg Zclg Zhfm Zhfm Za Za Za Za Za Zaps Zclg PMpu Zvg Zvg Zvg Zvg Zvg Zvg Zvg Zvs Za Za Za Zhc Zhc Db Db Db Db Db Db Db Zbg Zhf Zhl Zhc Mro Mro Za Zhf Zhf Zbg Zbg Za Za Zto Zto Zto Zhg Zhph Zhph Zhph Zhph Zhf Zhf Zto Zto Zto Zg Zg Zg Zg Zf Zf Zp Zp Zp Zp bi bi bi bi bi Zgl Zhf Zhf Zap Zap Zgh Zhc q Zvh Zvh Zvh Zvh gmg Zgl bim bim bim bim bim mg Zrhg Zkg gg gg gg gg gg ­Zbg ­Zbg Zrbg Zrbg Zrbg Zrbg Zrbg P w Zrbgm P gm Zhc Zhc Zrms Zrms Zrss Zrss Zrss Zrss Zrss Zrms PMmgs Zap Zap Zap Zap Zap Zap Zap PMps Zac Zac Zac PMpu PMmgs P gm Mqw q q q Zac Banister River Wolf Trap Centerville Peter Creek Dan River Dan River Roanoke River Roanoke River Butcher Creek JOHN H. KERR RESERVOIR JOHN H. KERR RESERVOIR Smith Creek Cotton Creek Ready Branch Hawtree Creek LAKE GASTON U.S. ROUTE 501 STATE ROUTE 716 STATE ROUTE 304 STATE ROUTE 654 STATE ROUTE 614 U.S. ROUTE 360 U.S. ROUTE 1 STATE ROUTE 712 STATE ROUTE 4 Palmer Springs INTERSTATE ROUTE 85 Five Forks ISLAND CREEK SYNCLINE NORTH BEND PARK AND MARINA OCCONEECHEE ANTICLINE NUTBUSH CREEK MYLONITE ZONE LAKE GORDON MYLONITE ZONE WISE PLUTON BUGGS ISLAND PLUTON VANCE PLUTON BUFFALO PLUTON SCOTTSBURG BASIN DRYBURG SYNCLINE LAWSONS CREEK ANTIFORM THRUST CONTACT IN HYCO SHEAR ZONE U.S. ROUTE 58 U.S. ROUTE 15 MILTON TERRANE WESTERN FLANK OF CAROLINA TERRANE SCOTTSBURG BASIN CAROLINA SLATE BELT OF CAROLINA TERRANE RALEIGH TERRANE SURFACE SURFACE SURFACE 3,000 3,000 2,000 2,000 1,000 1,000 METERS 3,000 3,000 2,000 2,000 1,000 1,000 METERS SEA LEVEL SEA LEVEL A A' A A' 1,000 meters 3,281 feet Surficial deposits are not shown Only named folds shown in cross section NO VERTICAL EXAGGERATION Zhc Zhc Zhb Zhb Zhb Zhl Zhl Zhq Zvgs Zvgs Zvh Zf Zg Zg Zp Zvh Zhf Zhb Zbg Zhb Zvb Zvg Zhc Zap Zap Zap Zap Zap Zap Zas Zhc Zhf Zvs Zvg Zvg Zag Za Za Za Za Zac Zcm Zac Zrbgm Zrbg Zrbg Zrbg Zrhg Zrss Zrss Zrss Zrss Zgl Zbg Db Db Db Db Db Db Db Db Db Db Db bim bi bi bi P w P w P w P gm P gm gmg gmg mg mg Omc Osgr PMps fb Zgp Zgp Zcc Zcc Zclg sis sc cm Jdo Db bi Jdo Jd Jdm Jdq Za Zhb Zhb Zcl QNr af Qal Qco Qp3 Qp2 Np1 Nm Jdp Jdo Jdq Jd Jdm sis sc cm q Mqw fb PMpu PMps PMmgs P w P sh P sm P gr P gm gmg bim bi PMg Mgf Mgh Mgn Mgy DSto DShd mg grb gg Zt ­Zbg Zrbg Zrbgm Zrhg Zrms Zrag Zrss Zrbmg Zrmn Zrq Zrsg Mro Db q Zgl Zbgr Zgd Zgh Zvbm Zvb Zvto Zvh Zbg Zd Zm Zto Zqd Zdg Zmt Zgnv Zvs Zvg Zvgs Za Zap Zac Zas Zapv Zag Zasg Zaps Zhfm Zhfa Zhvb Zhf Zhc Zhq Zhs Zhst Zhv Zhcs Zhmm Zhd Zhl Zhph Zhqz Zhb Zhg Zhm Zhpm Zq Zg Zp Zms Zcl Zf Zmyv Zkg Zgn Zgp Zgb Zks Zcm Zclg Zcc bg Osgr Omi Omu Omm Omc Omg Oml Omf Omp Omb Omh LIST OF MAP UNITS [See Description of Map Units (in pamphlet) for complete unit descriptions and age information] REGOLITH Low-potassium residual soil (Holocene to Miocene) UNCONSOLIDATED SURFICIAL DEPOSITS Artificial fill Alluvium (Holocene) Colluvium (Quaternary) Fluvial terrace deposits Low-level terrace deposits (Pleistocene) Intermediate-level terrace deposits (Pleistocene) High-level terrace deposits (Pliocene) Highest-level terrace deposits (upper or middle Miocene) MESOZOIC RIFT-RELATED ROCKS DIKES [Approximately located, dotted where concealed] Porphyritic rhyolite and alkali basalt (Early Jurassic) Diabase (Early Jurassic) Olivine diabase Granophyre-bearing quartz diabase and monzodiorite Diabase, undivided Diabase inferred from magnetic anomalies SCOTTSBURG, RANDOLPH, AND ROANOKE CREEK BASINS [Lithofacies are independent of stratigraphic order within the Chatham Group] Chatham Group (Upper Triassic) Siltstone and sandstone Pebbly sandstone Conglomerate MISCELLANEOUS VEINS Quartz vein Quartz-huebnerite vein (Mississippian?) MISCELLANEOUS FAULT ROCKS Fault breccia (Cenozoic or Mesozoic?) Quartz cataclasite and silicified microbreccia (Jurassic or Triassic?) Phyllonite and ultramylonite of Clover shear zone (Permian to Mississippian) Phyllonitic white-mica schist (Permian to Mississippian) Mylonitic gneiss and schist (Permian to Mississippian) LATE PALEOZOIC INTRUSIVE ROCKS [Late Paleozoic intrusive rocks are shown under their respective terranes in the Correlation of Map Units] Muscovite-biotite granite of Wise pluton (Permian to Pennsylvanian) Muscovite-biotite granite of South Hill pluton (Permian to Pennsylvanian) Biotite-muscovite granite of Stones Mill pluton (Permian to Pennsylvanian) Biotite granite (Permian to Pennsylvanian) Mylonitic granite (Permian to Pennsylvanian) Lineated muscovite-biotite metagranite (Permian to Pennsylvanian) Granitic mylonitic gneiss (Pennsylvanian?) Biotite-muscovite granodiorite (Pennsylvanian) Mylonitic granite of Buggs Island pluton (Pennsylvanian) Granite of Buggs Island pluton (Pennsylvanian) Muscovite-biotite granite (Permian to Late Mississippian) Biotite granite of Farmers Lake (Pennsylvanian to Mississippian) Hornblende granite (Pennsylvanian to Mississippian) Metagranite of Saxe (Pennsylvanian to Mississippian) Gneissic biotite granite (Mississippian?) RALEIGH TERRANE INTRUSIVE ROCKS Biotite metatonalite (Devonian to Silurian) Hornblende metadiorite (Devonian to Silurian?) Muscovite granite (Paleozoic?) Biotite metagranite (Paleozoic?) Gneissic metagranitoid east of Kenbridge (Paleozoic?) Talc schist and soapstone (Neoproterozoic?) LAYERED AND STRATIFIED ROCKS [Stratigraphic order undetermined] Biotite-quartz-plagioclase gneiss (Cambrian or Neoproterozoic?) Metamorphic suite of South Hill (Neoproterozoic?) Biotite-quartz-feldspar gneiss of Union Mill Mylonitic biotite-quartz-feldspar gneiss of Union Mill Hornblende-biotite gneiss Muscovite schist and biotite-muscovite schist Augen-biotite gneiss Sillimanite-mica schist of Great Creek Biotite-muscovite gneiss Manganiferous schist and gneiss Quartzite Biotite-muscovite schist and gneiss CAROLINA SLATE BELT OF CAROLINA TERRANE (MAINLY GREENSCHIST FACIES) INTRUSIVE ROCKS Granite of Red Oak (Mississippian) Buffalo granite (Devonian) Pink quartz monzonite dikes (Paleozoic) Lineated leucogranite gneiss (Paleozoic or Neoproterozoic?) Biotite granodiorite (Paleozoic or Neoproterozoic) Biotite granite (Neoproterozoic) Hornblende gabbro (Neoproterozoic) Vance pluton (Neoproterozoic) Mylonitic biotite granodiorite to quartz monzonite Metamorphosed biotite granodiorite to leucogranite and quartz monzonite Metamorphosed biotite-hornblende tonalite Metamorphosed hornblende granodiorite to quartz diorite to quartz monzonite Metagranite of Orgainsville (Neoproterozoic) Foliated biotite quartz diorite (Neoproterozoic) Abbeyville metagabbro (Neoproterozoic) Biotite tonalite (Neoproterozoic?) Hornblende-biotite quartz diorite or tonalite (Neoproterozoic?) Hornblende diorite and gabbro (Neoproterozoic?) Tonalite at Mayo Reservoir (Neoproterozoic?) Granite of North View pluton (Neoproterozoic) LAYERED AND STRATIFIED ROCKS [Nomenclature for Hyco, Aaron, and Virgilina Formations follows Harris and Glover (1988). Lithofacies are independent of stratigraphic order within the Hyco, Aaron, and Virgilina Formations] Virgilina Formation (Neoproterozoic) Metasedimentary upper unit Greenstone lower unit Greenstone and chlorite-sericite phyllite Aaron Formation (Neoproterozoic) Metamudstone Phyllitic metasiltstone Metaconglomerate and metasandstone Metasandstone Volcanic metabreccia and metaconglomerate Felsic lithic and crystal-lithic metatuff Mafic metatuff Chlorite schist and greenstone Phyllonitic metasiltstone Hyco Formation (Neoproterozoic) Felsic mylonite Fine-grained felsic gneiss and amphibolite Felsic metavolcanic breccia and tuffaceous greenstone Fissile felsic metatuff Felsic crystal metatuff Quartz metaporphyry Zone of advanced argillic alteration Phyllite and phyllitic metasandstone Layered metasiltstone and metatuff Phyllitic volcaniclastic rock and mudflow breccia Lithic-crystal metatuff and volcanic metasandstone Pebbly metamudstone and crystal-lithic metatuff Fine-grained quartz dacite Coarse-grained felsic metatuff Phyllitic volcanic metasiltstone and metatuff Micaceous quartzite Metabasalt Greenstone Chloritic metatuff Fine-grained porphyritic metabasalt Vicinity of Nutbush Creek mylonite zone [Neoproterozoic ages are inferred for units similar to nearby Hyco and Aaron Formations. Stratigraphic order undetermined] Quartz rock (Paleozoic or Neoproterozoic?) Greenstone and chloritic phyllite (Neoproterozoic) Phyllitic metasiltstone (Neoproterozoic) Muscovite-quartz schist (Neoproterozoic) Felsic lithic and crystal-lithic metatuff (Neoproterozoic) Fine-grained felsite (Neoproterozoic) Mylonitic metavolcanic and metasedimentary rocks (Neoproterozoic) Gneiss of Kenbridge (Neoproterozoic?) WESTERN FLANK OF CAROLINA TERRANE (MAINLY EPIDOTE-AMPHIBOLITE FACIES TO AMPHIBOLITE FACIES) INTRUSIVE ROCKS Mica gneiss and metagranite, undivided (Paleozoic to Neoproterozoic?) Megacrystic biotite-quartz-feldspar orthogneiss (Paleozoic or Neoproterozoic?) Metagabbro or metadiorite (Paleozoic or Neoproterozoic?) LAYERED AND STRATIFIED ROCKS [Stratigraphic order undetermined] Kyanite-mica schist (Paleozoic or Neoproterozoic?) Country Line complex (Neoproterozoic) Mylonitic biotite-hornblende gneiss of Cluster Springs Biotite-hornblende gneiss of Cluster Springs Layered gneiss of South Boston MILTON TERRANE INTRUSIVE ROCKS Foliated biotite granite (Paleozoic?) Metagranite and mica gneiss of Shelton Formation (Ordovician) Amphibolitic metagabbro (Ordovician?) Altered ultramafic rock (Ordovician?) LAYERED AND STRATIFIED ROCKS [Stratigraphic order undetermined] Cunningham complex (Ordovician) Biotite gneiss and schist of Cedar Grove Biotite gneiss of Halifax Biotite metagranite and fine-grained felsic gneiss (Ordovician) Fine-grained felsic gneiss (Ordovician) Gneiss of Conner Lake (Ordovician?) Biotite-quartz-feldspar gneiss (Ordovician?) Biotite felsic gneiss of Turnip Creek (Ordovician?) Biotite-hornblende gneiss of Ellis Creek (Ordovician?) EXPLANATION OF MAP SYMBOLS Contact—Approximately located, dotted where concealed FAULTS [Faults can show more than one sense of displacement] Thrust fault—Approximately located, dotted where concealed; sawteeth on upper plate Normal fault—Approximately located, dotted where concealed; ball and bar on downthrown side Strike-slip fault—Approximately located, dotted where concealed; arrows show relative movement Unclassified fault—Approximately located, dotted where concealed; sense of displacement not known FOLDS [Showing trace of axial surface, direction of dip of limbs, and direction of plunge where known or inferred. Approximately located, dotted where concealed. In cross section, fold axes are dashed. Sequential fold generations (F1-F4) are numbered independently within domains of the Carolina, Raleigh, and Milton terranes. For example, F1 in Neoproterozoic rocks of the Carolina terrane is not equivalent to F1 in Ordovician rocks of the Milton terrane. Accompanying geodatabase files use letter codes to distinguish folds in the Carolina, Raleigh, and Milton terranes (for example, F1c, F1r, and F1m, respectively)] F1 antiform F1 overturned antiform F1 synform F1 overturned synform F2 antiform F2 overturned antiform F2 synform F2 overturned synform F3 antiform F3 synform F3 overturned synform F4 antiform F4 overturned antiform F4 synform DIKES AND VEINS [Approximately located, dotted where concealed] Porphyritic rhyolite and alkali basalt (Early Jurassic)—Jdp in List of Map Units Olivine diabase (Early Jurassic)—Jdo in List of Map Units Granophyre-bearing quartz diabase and monzodiorite (Early Jurassic)—Jdq in List of Map Units Diabase, undivided (Early Jurassic)—Jd in List of Map Units Diabase inferred from magnetic anomalies (Early Jurassic)—Jdm in List of Map Units Quartz vein—q in List of Map Units Quartz-huebnerite vein—Mqw in List of Map Units Biotite-muscovite granodiorite dike— bmg in List of Map Units Pink quartz monzonite dike— q in List of Map Units PLANAR FEATURES [Where combined with other planar or linear features, measurement is at point of intersection] Strike and dip of bedding (S0)—Ball shows top direction of beds known from primary sedimentary features Inclined Inclined Vertical Overturned Overturned Strike and dip of bedding or layering and parallel foliation (S0 and S1) Inclined Vertical Strike and dip of main foliation, schistosity, or cleavage (S1) Inclined Vertical Strike and dip of mylonitic foliation Inclined Vertical Strike and dip of shear bands Inclined Vertical Strike and dip of flow foliation in igneous rock Inclined Vertical Strike and dip of joint Inclined Vertical LINEAR FEATURES [Where combined with planar features, measurement is at point of intersection] Bearing and plunge of mineral elongation Inclined Horizontal Bearing and plunge of crenulation axis (deforming foliation or schistosity), inclined OTHER FEATURES Active quarry—a, aggregate (crushed stone); s, sand Abandoned quarry or mine—a, aggregate (crushed stone); Cu, copper; W, tungsten Areas of ductile shear bmg Zhar J sb P gl Zab Base from U.S. Geological Survey, 1984 1927 North American Datum 25,000-foot grid ticks based on Virginia coordinate system, south zone, and North Carolina coordinate system 10,000-meter Universal Transverse Mercator grid ticks, zone 17 10 KILOMETERS SCALE 1:100 000 8 MILES CONTOUR INTERVAL 10 METERS NATIONAL GEODETIC VERTICAL DATUM OF 1929 MAGNETIC NORTH APPROXIMATE MEAN DECLINATION, 2022 TRUE NORTH 9.2° Geologic Map of the South Boston 30' × 60' Quadrangle, Virginia and North Carolina By J. Wright Horton, Jr., John D. Peper,1 William C. Burton, Robert E. Weems, and Paul E. Sacks 1Deceased Geology mapped from 1991 to 2013 GIS database and cartography by E. Allen Crider, Jr. (2011-2022) Edited by Zachary P. Younger; digital cartographic production by Linda M. Masonic Manuscript approved for publication November 10, 2021 Scientific Investigations Map 3483 U.S. Department of the Interior U.S. Geological Survey Supersedes USGS Open-File Report 93-244 Pamphlet accompanies map Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government Digital files available at https://doi.org/10.5066/P98AQDR7 Suggested citation: Horton, J.W., Jr., Peper, J.D., Burton, W.C., Weems, R.E., and Sacks, P.E., 2022, Geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina: U.S. Geological Survey Scientific Investigations Map 3483, 1 sheet, scale 1:100,000, 46-p. pamphlet, https://doi.org/10.3133/sim3483. [Supersedes USGS Open-File Report 93-244.] Associated data for this publication: Horton, J.W., Jr., Peper, J.D., Burton, W.C., Weems, R.E., Sacks, P.E., and Crider, E.A., Jr., 2022, Database for the geologic map of the South Boston 30' × 60' quadrangle, Virginia and North Carolina: U.S. Geological Survey data release, https://doi.org/10.5066/P98AQDR7. ISSN 2329-132X (online) https://doi.org/10.3133/sim3483 NORTH CAROLINA CHARLOTTE COUNTY LUNENBURG COUNTY MECKLENBURG COUNTY BRUNSWICK COUNTY HALIFAX COUNTY PERSON COUNTY GRANVILLE COUNTY VANCE COUNTY WARREN COUNTY VIRGINIA INDEX OF 1:24,000-SCALE QUADRANGLES (TOPOGRAPHIC MAPS) 36°30' 36°30' 37° 37° 79° 78° 79° 78° CONNER LAKE FORT MITCHELL DRAKES BRANCH LUNENBURG KENBRIDGE EAST KENBRIDGE WEST SAXE SCOTTSBURG CLOVER WYLLIESBURG WIGHTMAN NORTH VIEW FORKSVILLE CHASE CITY BUFFALO SPRINGS CLARKSVILLE NORTH SOUTH HILL LA CROSSE BOYDTON BASKERVILLE OMEGA NELSON CLARKSVILLE SOUTH TUNGSTEN SOUTH HILL SE JOHN H KERR DAM BRACEY VIRGILINA NATHALIE HALIFAX SOUTH BOSTON CLUSTER SPRINGS VIRGINIA NORTH CAROLINA MAP LOCATION QUATERNARY NEOGENE CENOZOIC PALEOZOIC OR NEOPROTEROZOIC PALEOZOIC NEOPROTEROZOIC JURASSIC TRIASSIC PERMIAN PENNSYLVANIAN MISSISSIPPIAN DEVONIAN SILURIAN ORDOVICIAN Metamorphic suite of South Hill CAROLINA SLATE BELT OF CAROLINA TERRANE Cunningham complex Country Line complex Aaron Formation Hyco Formation Virgilina Formation Vicinity of Nutbush Creek mylonite zone Vance pluton MILTON TERRANE RALEIGH TERRANE MISCELLANEOUS FAULT ROCKS MISCELLANEOUS VEINS WESTERN FLANK OF CAROLINA TERRANE CORRELATION OF MAP UNITS [See Description of Map Units (in pamphlet) for precise unit ages] UNCONSOLIDATED SURFICIAL DEPOSITS MESOZOIC RIFT-RELATED ROCKS REGOLITH Dikes Chatham Group Pliocene Pleistocene Holocene Miocene Early Jurassic Upper Triassic MESOZOIC CAMBRIAN bmg Zvs Zvg Zvgs Za Zap Zac Zas Zab Zapv Zag Zasg Zaps Zrbg Zrbgm Zrhg Zrms Zrag Zrss Zrbmg Zrmn Zrq Zrsg Zgd Zgl Zvto Zvbm Zvb Zvh Zg Zp Zms Zcl Zf Zmyv Zkg PMg Mro Db bim bi Mgf ­Zbg P w P sh P sm P gr P gm gmg P gl DSto DShd mg grb gg Zt Omc Omm Omi Omu Osgr bg Omh Omb Omp Omf Oml Omg PMpu PMmgs PMps J sb fb Mqw Zks Zgb Zgp Zgn Zcm Zclg Mgh Mgn Mgy Zq Jdo sis sc cm Jdq Jd Jdm Jdp QNr Qal Qco Qp3 Qp2 Np1 Nm af Zcc q q unconformity Zhd Zhmm Zhcs Zhv Zhst Zhs Zhl Zhar Zhq Zhc Zhf Zhvb Zhfa Zhfm Zhpm Zhm Zhg Zhb Zhqz Zhph Zbgr Zbg Zd Zm Zto Zqd Zgh Zmt Zgnv Zdg