Open-File Report 10-01 Bedrock Geologic Map of the ... · Division of Mineral Resources Report of...
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A A’ Ost Ost Ost Ost Ob Ob Ob Ob Ob Ob Ob Ob Ob Oln Oln Oln Oln |e |e Omb |wb Oe Oe Oe O|co O|co O|co Oln Oln Oln Oln Oe Oe Oe Ob Ob Ob Ob Ob O|co O|co O|co |e |e |e |e |e |e |e |e |e |e |e Ob Ob Ob Ob Ob Ob Ob Ob O|co O|co O|co O|co O|co O|co O|co O|co O|co O|co Ost Ob Ob Ob Ob Oln 86 54 40 56 66 70 39 25 31 76 31 84 10 5 41 20 20 8 4 15 15 20 20 55 40 24 26 10 10 10 17 74 66 21 76 12 29 19 30 32 15 3 27 34 72 5 10 31 44 21 10 10 20 20 14 52 33 30 26 76 20 21 4 4 6 5 21 31 28 78 74 72 70 37 21 26 15 35 43 34 37 60 10 22 6 26 20 29 30 32 31 52 59 24 42 20 19 32 46 23 45 20 86 45 30 29 30 26 30 21 10 33 53 59 56 21 43 40 9 10 10 10 70 70 13 73 7 12 68 38 16 72 61 30 30 28 40 47 39 30 23 19 12 20 20 3 33 25 20 9 24 33 29 31 34 12 4 5 16 25 10 7 20 20 15 16 10 53 22 19 24 16 26 16 15 32 11 11 29 20 21 30 37 24 12 37 10 21 30 46 48 29 39 20 26 22 51 40 41 12 8 12 17 20 20 26 33 38 27 25 26 20 36 5 22 13 42 81 82 63 74 22 20 18 22 41 20 72 69 76 66 48 47 34 75 32 38 21 40 21 36 66 29 12 17 7 26 32 24 78 79 64 58 57 81 22 39 20 13 33 13 31 31 35 47 34 32 34 36 37 53 32 26 27 22 32 25 42 39 29 31 27 27 70 71 14 74 69 56 48 85 83 65 47 46 59 40 20 52 81 43 55 34 72 31 30 35 21 31 32 16 47 33 48 12 32 19 26 20 28 20 31 23 19 10 17 40 39 36 33 62 33 32 29 46 14 22 12 20 34 27 27 34 26 33 30 34 41 48 30 24 46 26 26 23 24 23 26 28 40 59 27 24 15 16 43 24 34 10 15 10 27 19 29 16 5 52 65 26 39 54 43 40 60 64 76 77 71 76 72 47 31 40 7 6 16 19 51 20 63 21 24 58 29 22 20 21 33 34 26 17 10 16 23 19 15 20 29 16 13 20 19 8 9 14 67 32 11 20 29 19 14 49 16 37 5 74 20 31 37 77 44 14 44 26 22 17 30 30 26 17 6 20 26 31 30 24 61 43 34 29 39 14 27 64 19 13 20 21 82 54 12 74 32 81 74 40 27 21 7 12 32 17 12 5 5 15 15 17 9 15 16 63 72 63 17 76 26 60 60 5 50 64 43 40 16 15 56 33 10 10 30 13 15 10 3 23 1 29 35 21 36 32 41 17 11 43 22 61 22 20 34 23 11 59 39 20 30 5 40 8 36 26 36 30 5 5 20 7 69 15 34 20 5 16 5 5 5 40 5 10 11 13 24 16 33 30 31 31 18 53 37 38 28 29 47 70 77 62 62 25 27 68 77 54 54 51 40 50 50 50 36 75 50 35 30 59 44 38 45 46 34 49 44 40 60 42 37 11 28 39 40 47 47 33 64 5 68 29 51 58 60 71 84 79 44 51 70 31 55 31 60 51 51 47 53 60 41 63 39 57 50 46 56 60 20 77 64 33 20 73 41 50 50 20 40 30 16 31 30 16 20 66 55 54 55 60 62 61 57 64 34 26 26 34 79 50 25 24 51 50 42 34 37 26 20 20 24 20 20 26 34 30 7 7 34 13 4 22 30 30 33 44 38 40 46 45 39 50 45 40 5 9 10 12 12 23 20 15 15 20 17 6 5 5 8 15 20 31 44 25 71 64 46 12 25 44 27 30 21 16 32 20 86 83 20 44 FAIRFIELD FAUL T BROWNSBURG WINDOW HAYS CREEK WINDOW NORTH M O U N T A I N FAUL T N O R T H M O UNT AIN FAUL T NORTH MOUNT AIN FAULT STAUNTON FAULT |e STAUNTON FAULT ls-303 fe-301 al-301 al-305 cs-302 Interpretive cross-section 1. No vertical exaggeration 2. Subsurface structures interpreted from surface measurements FEET 79°22’30” 37°52’30” 38° 00’ 2010 Basemap, modified U.S. Geological Survey DRG 1967 Brownsburg Quadrangle, Virginia Polyconic projection: UTM zone 17, NAD 1927 Digital Cartography by: Marcie Occhi, Jason Elliott, Julia Reis and Amy Gilmer MN GN 0 39 o ' 9 8’ o 162 MILS 12 MILS 2010 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET Geology mapped from 2004 to 2005 SCALE 1:24,000 1 1 0.5 0 1 KILOMETER 1000 1000 2000 3000 4000 5000 6000 7000 FEET 0 0 0.5 1 MILE CONTOUR INTERVAL 20 FEET NATIONAL GEODETIC VERTICAL DATUM OF 1929 Virginia Department of Mines, Minerals and Energy 79° 15’ 79°22’30” 38°00’ Open-File Report 10-01 Bedrock Geologic Map of the Brownsburg Quadrangle, Virginia Virginia Division of Geology and Mineral Resources Gerald P. Wilkes BEDROCK GEOLOGIC MAP OF THE BROWNSBURG QUADRANGLE, VIRGINIA MAP SYMBOLS PALEOZOIC Martinsburg Formation – Upper: sandstone, siltstone, and shale, light- to medium-gray, distinctive Orthorhynchula zone near top of unit; sandstone, fine-grained, thin-bedded. Lower: limestone, argillaceous, light- to dark-gray, thick- to thin-bedded. Thickness: approximately 1500 feet (460 meters). Edinburg Formation – Liberty Hall facies: limestone, black to dark-gray, fine-grained, thin-bedded, interbedded with black shale. Lantz Mill facies: limestone, black, medium- to coarse-grained, nodular weathering, medium- to thick-bedded. Collierstown limestone: local limestone, coarse-grained, fossilifer- ous (notably coral). Botetourt Member: local limestone, reddish-weathering, massive, fossiliferous. Black shale at the base. Thickness: 800 to 1250 feet (240 to 380 meters). Lincolnshire Formation and New Market Limestone – Lincolnshire Forma- tion: limestone, dark-gray, fine- to coarse-grained, thick- to thin-bedded, with bedded black chert. Murat facies: local limestone, light-gray, coarse-grained, biostromal, massive. Whistle Creek limestone: local limestone, black, argilla- ceous, and calcareous shale. New Market Limestone: limestone, microcrystalline, light-gray, massive. Thickness: 100 to 435 feet (30 to 135 meters). Beekmantown Formation – Dolostone, light- to medium-gray, fine-grained, thick-bedded, distinctive “butcher-block” weathering, with black bedded and nodular chert, thick beds of white massive chert near top of unit, with some interbeds of limestone, light- to medium-gray, thick- to thin-bedded. Thickness: 1500 to 2000 feet (460 to 610 meters). Stonehenge Formation – Limestone, dark bluish-gray to black, fine-grained, thick- to medium-bedded with bedded black chert. Only mappable on the Staunton thrust sheet. Elsewhere the Stonehenge is too thin and is included in the Beekmantown Formation. Thickness: 10 to 500 feet (3 to 150 meters). Conococheague Formation – Limestone, light- to medium-gray, fine-grained, containing varying amounts of rounded quartz sand grains, thin-bedded to very thick-bedded. Lesser amounts of light-gray, fine- to medium-grained dolostone, and calcareously cemented, medium- to coarse-grained sandstone. Minor amounts of bedded black chert. Silty laminae stand out in relief on weathered surfaces. Thickness: 2000 to 2500 feet (610 to 760 meters). Elbrook Formation – Dolostone and limestone, light- to medium-gray, fine- to medium- grained, thin- to thick-bedded, where thin-bedded with minor amounts of pink and green shale. Soils weathering from the Elbrook produce a channery surface. Thickness: 1325 to 2300 feet (400 to 700 meters). Waynesboro Formation – Maroon, tan, and white, very thin- to thick-bedded phyllite and argillite, interbedded with limestone, dolostone, and sandstone. Thickness: undetermined. SOURCES Bick, K.F., 1960, Geology of the Lexington quadrangle, Virginia: Virginia Division of Mineral Resources Report of Investigations 1, 40 p., 1:62500- scale map. Butts, C., 1941, Geology of the Appalachian Valley in Virginia, Virginia Geologi- cal Survey Bulletin 52, 566 p., 1:250,000-scale map. Virginia Division of Mineral Resources, 1993, Geologic map of Virginia: Virginia Division of Mineral Resources, 1:500,000-scale map with expanded expla- nation, 80 p. ACKNOWLEDGEMENTS This map was prepared in cooperation with the United States Geological Survey under the National Cooperative Geologic Mapping Program, awards 04HQAG0062 and 06HQAG0039. SUGGESTED REFERENCE Wilkes, G.P., 2010, Bedrock geologic map of the Brownsburg quadrangle, Virginia: Virginia Division of Geology and Mineral Resources Open File Report 10-01, 1:24,000-scale map. DESCRIPTION OF MAP UNITS Ost Omb Ob Oe Oln 79°15’ 37°52’30” (VESUVIUS) Mineral Resources - identification numbers are preceded by “157A-” in Mineral Resources of Virginia database Brownsburg Lexington Cornwall Montebello Craigsville Greenville Augusta Springs Vesuvius Goshen
Transcript of Open-File Report 10-01 Bedrock Geologic Map of the ... · Division of Mineral Resources Report of...
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ls-303fe-301
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Interpretive cross-section1. No vertical exaggeration2. Subsurface structures interpreted from surface measurements
FEET
79°22’30”37°52’30”
38° 00’
2010
Basemap, modified U.S. Geological Survey DRG 1967 Brownsburg Quadrangle, Virginia
Polyconic projection: UTM zone 17, NAD 1927
Digital Cartography by: Marcie Occhi, Jason Elliott, Julia Reis and Amy Gilmer
MNGN
0 39o '9 8’o
162 MILS12 MILS
2010 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET Geology mapped from 2004 to 2005
SCALE 1:24,0001
1 0.5 0 1 KILOMETER
1000 1000 2000 3000 4000 5000 6000 7000 FEET0
00.5 1 MILE
CONTOUR INTERVAL 20 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929
VirginiaDepartment of
Mines, Mineralsand Energy
(HA
RD
Y)
79° 15’
79° 52’ 30’’
79°22’30”38°00’
Open-File Report 10-01Bedrock Geologic Map of the Brownsburg Quadrangle, Virginia
Virginia Division of Geology and Mineral Resources
Gerald P. Wilkes
BEDROCK GEOLOGIC MAP OF THE BROWNSBURG QUADRANGLE, VIRGINIA
MAP SYMBOLS
PALEOZOIC
Martinsburg Formation – Upper: sandstone, siltstone, and shale, light- to medium-gray, distinctive Orthorhynchula zone near top of unit; sandstone, fine-grained, thin-bedded. Lower: limestone, argillaceous, light- to dark-gray, thick- to thin-bedded. Thickness: approximately 1500 feet (460 meters).
Edinburg Formation – Liberty Hall facies: limestone, black to dark-gray, fine-grained, thin-bedded, interbedded with black shale. Lantz Mill facies: limestone, black, medium- to coarse-grained, nodular weathering, medium- to thick-bedded. Collierstown limestone: local limestone, coarse-grained, fossilifer-ous (notably coral). Botetourt Member: local limestone, reddish-weathering, massive, fossiliferous. Black shale at the base. Thickness: 800 to 1250 feet (240 to 380 meters).
Lincolnshire Formation and New Market Limestone – Lincolnshire Forma-tion: limestone, dark-gray, fine- to coarse-grained, thick- to thin-bedded, with bedded black chert. Murat facies: local limestone, light-gray, coarse-grained, biostromal, massive. Whistle Creek limestone: local limestone, black, argilla-ceous, and calcareous shale. New Market Limestone: limestone, microcrystalline, light-gray, massive. Thickness: 100 to 435 feet (30 to 135 meters).
Beekmantown Formation – Dolostone, light- to medium-gray, fine-grained, thick-bedded, distinctive “butcher-block” weathering, with black bedded and nodular chert, thick beds of white massive chert near top of unit, with some interbeds of limestone, light- to medium-gray, thick- to thin-bedded. Thickness: 1500 to 2000 feet (460 to 610 meters).
Stonehenge Formation – Limestone, dark bluish-gray to black, fine-grained, thick- to medium-bedded with bedded black chert. Only mappable on the Staunton thrust sheet. Elsewhere the Stonehenge is too thin and is included in the Beekmantown Formation. Thickness: 10 to 500 feet (3 to 150 meters).
Conococheague Formation – Limestone, light- to medium-gray, fine-grained, containing varying amounts of rounded quartz sand grains, thin-bedded to very thick-bedded. Lesser amounts of light-gray, fine- to medium-grained dolostone, and calcareously cemented, medium- to coarse-grained sandstone. Minor amounts of bedded black chert. Silty laminae stand out in relief on weathered surfaces. Thickness: 2000 to 2500 feet (610 to 760 meters).
Elbrook Formation – Dolostone and limestone, light- to medium-gray, fine- to medium- grained, thin- to thick-bedded, where thin-bedded with minor amounts of pink and green shale. Soils weathering from the Elbrook produce a channery surface. Thickness: 1325 to 2300 feet (400 to 700 meters).
Waynesboro Formation – Maroon, tan, and white, very thin- to thick-bedded phyllite and argillite, interbedded with limestone, dolostone, and sandstone. Thickness: undetermined.
SOURCES
Bick, K.F., 1960, Geology of the Lexington quadrangle, Virginia: Virginia Division of Mineral Resources Report of Investigations 1, 40 p., 1:62500-scale map.
Butts, C., 1941, Geology of the Appalachian Valley in Virginia, Virginia Geologi-cal Survey Bulletin 52, 566 p., 1:250,000-scale map.
Virginia Division of Mineral Resources, 1993, Geologic map of Virginia: Virginia Division of Mineral Resources, 1:500,000-scale map with expanded expla-nation, 80 p.
ACKNOWLEDGEMENTS
This map was prepared in cooperation with the United States Geological Survey under the National Cooperative Geologic Mapping Program, awards 04HQAG0062 and 06HQAG0039.
SUGGESTED REFERENCE
Wilkes, G.P., 2010, Bedrock geologic map of the Brownsburg quadrangle, Virginia: Virginia Division of Geology and Mineral Resources Open File Report 10-01, 1:24,000-scale map.
DESCRIPTION OF MAP UNITS
Ost
Omb
Ob
Oe
Oln
79°15’37°52’30”
(VE
SU
VIU
S)
Mineral Resources - identification numbers are preceded by “157A-” in Mineral Resources of Virginia database
Brow
nsbu
rg
Lexin
gton
Cornw
all
Mon
tebel
lo
Craig
sville
Green
ville
Augus
taSp
rings
Vesu
vius
Goshe
n
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