L eg nd - Vermont · P in a cleF o rm t-g hd uy ,f sv pb q z w ack endphy l it; o mb uq r zg s. I (...
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The hydro digital elevation model was processed using Spatial Analysts's focal statistics tool to smooth the dataset. Coordinate system: Vermont State Plane, meters, NAD 83. Grid overlay is Universal Transverse Mercator, Zone 18N, NAD 83. Digitization and digital cartography: M. Gale, 2012 Research supported by the Vermont Geological Survey, Dept. of Environmental Conservation, VT ANR. This map was funded in part by the USGS National Cooperative Mapping Program. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing official policies, either expressed or implied, of the U.S. Government. The authors wish to thank the residents of Vermont for allowing access to their properties. Published by: Vermont Geological Survey Laurence Becker, State Geologist Dept. of Environmental Conservation Agency of Natural Resources 103 South Main St. Waterbury, VT 05671-2420 http://www.anr.state.vt.us/dec/geo/vgs.htm OPEN FILE REPORT VG12-3: BEDROCK GEOLOGIC MAP OF THE ESSEX JUNCTION, VERMONT 7.5 MINUTE QUADRANGLE by Marjorie Gale, Jonathan Kim and Abigail Ruksznis 2012 References and acknowledgements: Mapping was completed in 2007 for the Town of Williston and is available as: Kim, J., Gale, M., Thompson, P.J., and Derman, K., 2007, Bedrock geologic map of the town of Williston, Vermont: Vermont Geological Survey Open File Report VG07-4, scale 1:24,000. Mapping in the remainder of the quadrangle was completed in 2012 as part of this report. Vermont Geological Survey Open File Report VG12-3 Bedrock Geologic Map of the Essex Junction, VT Quadrangle HINESBURG THRUST A A' View to the northeast from St. George Fairfield Pond Formation quartzite bed and close-up of phyllite Pinnacle Formation Overturned F3 fold, conglomerate, and pinstripe wacke with crenulate cleavage Tight F4 folds deform the crenulate cleavage Open, upright F3 fold in pinstripe metawacke Legend ! Field Station ( Thrust fault, teeth on upper plate Contact, long dash where approximate, short dash where inferred Cross Section Line Roads Water USGS Quadrangle Boundary o Strike and dip of bedding, commonly transposed (S0/S1) « Strike and dip of compositional layering (S1) È Strike and dip of older crenulate cleavage and associated axial planes of tight to open folds (F3) which deform compositional layering (S1) É Strike and dip of superposed axial plane crenulate cleavage (F4) Ô Trend and plunge of fold axis and crenulate lineation (L3) Ô trend and plunge of fold axis (L4) ¹ Strike and dip of schistosity and shear bands (S2) Cambrian Clarendon Springs Formation - Light to dark gray, massive, granular, recrystallized dolostone and breccia with chert and dolostone clasts. Csp Danby Formation - Fine to medium grained, gray dolomitic sandstone, commonly with visible rounded gray quartz sand grains. Cda Dunham Formation - Tan to brown weathering, buff to light gray, massively bedded dolostone. Cdu Cheshire Formation - Light to dark gray, massive, fine to medium grained quartzite and argillaceous quartzite. Cc Argillaceous quartzite member -fine to medium grained, gray and rusty weathering, dark gray argillaceous quartzite with abundant quartz veins. Cca Cheshire Formation Lower Ordovician to Cambrian Skeels Corners Slate - Dark gray to gray phyllite and laminated slate with thin (1-5 mm) orange-weathering dolomite layers. OCsk Cambrian to Neoproterozoic Fairfield Pond Formation - Silvery tan and rusty weathering, light green to gray, phyllite, schist and phyllitic granofels; locally interbedded with dark gray argillaceous quartzite; interlayered with Pinnacle Formation. Contact with overlying Cheshire Fm. is gradational. CZfp Quartzite member - rusty weathering, dark gray argillaceous quartzite and dark gray schist, occurs locally north of Christmas Hill Rd. CZfpq Fairfield Pond Formation Pinnacle Formation Pinnacle Formation - light to medium gray, folaited to massive to pinstriped, muscovite-chlorite-biotite-feldspar-quartz schist, wacke and phyllite; commonly with blue quartz pebble conglomerate beds. Includes thick (up to 3 meters) bedded metawacke and quartzite, banded quartzite and pinstriped (1-2 mm) meatwacke and schist. Bedding is commonly transposed and two generations of pinstripes are evident. Interlayered with metavolcanic rocks and chlorite schist. CZp Quartzite member - Coarse- grained, massive conglomerate with rounded blue-quartz pebbles; includes medium grained, massive, thick (1-3 meter) bedded, light and dark gray banded quartzite (CZpqm) CZpq CZpqm Large cobble conglomerate member - poorly sorted cobble conglomerate in a chaotic dolomitic phyllite matrix. Cobbles include gneiss, quartzite, quartz, limestone, dolostone, slate and felsic igneous rock. Some clasts appear stretched; clasts decrease in size to the west within 5 meters. Occurs locally south of Johnnie Brook Road at east side of quadrangle. CZpcg Chlorite schist - rusty weathering, fine grained, medium green chlorite schist; interbedded with CZp and CZpv. CZpcs Greenstone member - rusty weathering, dark green, fine grained, epidote-albite-chlorite metavolcanic and calcareous greenstone; Interbedded with CZp. CZpv Metawacke and schist member - light to dark gray and gray-green, fine to medium grained schist and striped schist with magnetite. CZps
Transcript of L eg nd - Vermont · P in a cleF o rm t-g hd uy ,f sv pb q z w ack endphy l it; o mb uq r zg s. I (...
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Essex
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Winooski River
Allen Brook
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Johnnie Brook
Mill Brook
Indian Brook
ESSEX JUNCTION_Zp
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ÖNMN
Magnetic declination14.5 degrees west, 2009
0.5 0 0.5 1 1.5 20.25Miles
0.5 0 0.5 1 1.5 20.25Kilometers
1:24,000Scale
The 20 ft contours were generatedusing the VTs "hydrologically Corrected" Digital ElevationModel (VTHYDRODEM) available through VCGI.org.The hydro digital elevation model was processed usingSpatial Analysts's focal statistics tool to smooth the dataset.Coordinate system: Vermont State Plane, meters, NAD 83.Grid overlay is Universal Transverse Mercator,Zone 18N, NAD 83.Digitization and digital cartography: M. Gale, 2012
Research supported by the Vermont Geological Survey, Dept. of Environmental Conservation, VT ANR.This map was funded in part by the USGS National Cooperative Mapping Program. The viewsand conclusions contained in this document are those of the authors and should not be interpretedas necessarily representing official policies, either expressed or implied, of the U.S. Government.The authors wish to thank the residents of Vermont for allowing access to their properties.
Published by: Vermont Geological SurveyLaurence Becker, State GeologistDept. of Environmental ConservationAgency of Natural Resources103 South Main St.Waterbury, VT 05671-2420http://www.anr.state.vt.us/dec/geo/vgs.htm
OPEN FILE REPORT VG12-3: BEDROCK GEOLOGIC MAP OF THE ESSEX JUNCTION, VERMONT 7.5 MINUTE QUADRANGLE
by Marjorie Gale, Jonathan Kim and Abigail Ruksznis
2012
References and acknowledgements:Mapping was completed in 2007 for the Town of Williston and is available as:Kim, J., Gale, M., Thompson, P.J., and Derman, K., 2007, Bedrock geologic map of the town of Williston, Vermont: Vermont Geological Survey Open File Report VG07-4, scale 1:24,000. Mapping in the remainder of the quadrangle was completed in 2012 as part of this report.
Vermont Geological Survey Open File Report VG12-3Bedrock Geologic Map of the Essex Junction, VT Quadrangle
HINESBURG THRUST
A
A'
View to the northeast from St. GeorgeFairfield Pond Formationquartzite bed and close-up of phyllite
Pinnacle FormationOverturned F3 fold, conglomerate, and pinstripe wacke with crenulate cleavage Tight F4 folds deform the crenulate cleavage Open, upright F3 fold in
pinstripe metawacke
Legend
! Field Station
(( Thrust fault, teeth on upper plate
Contact, long dash where approximate, short dash where inferred
Cross Section Line
Roads
WaterUSGS Quadrangle Boundary
o
Strike and dip of bedding, commonly transposed (S0/S1)
«
Strike and dip of compositional layering (S1)
È Strike and dip of older crenulate cleavage and associated axial planes of tight to open folds (F3) which deform compositional layering (S1)
É
Strike and dip of superposed axial plane crenulate cleavage (F4)
Ô Trend and plunge of fold axis and crenulate lineation (L3)
Ô trend and plunge of fold axis (L4)
¹
Strike and dip of schistosity and shear bands (S2)
Cambrian
Clarendon Springs Formation - Light to dark gray, massive, granular, recrystallized dolostone and breccia with chert and dolostone clasts.Csp
Danby Formation - Fine to medium grained, gray dolomitic sandstone, commonlywith visible rounded gray quartz sand grains.Cda
Dunham Formation - Tan to brown weathering, buff to light gray, massively bedded dolostone.Cdu
Cheshire Formation - Light to dark gray, massive, fine to medium grained quartzite and argillaceous quartzite.CcArgillaceous quartzite member -fine to medium grained, gray and rusty weathering, dark gray argillaceous quartzite with abundant quartz veins.Cca
Cheshire Formation
Lower Ordovician to Cambrian
Skeels Corners Slate - Dark gray to gray phyllite and laminated slate with thin (1-5 mm) orange-weathering dolomite layers.OCsk
Cambrian to Neoproterozoic
Fairfield Pond Formation - Silvery tan and rusty weathering, light green to gray, phyllite, schist and phyllitic granofels; locally interbedded with dark gray argillaceous quartzite; interlayered with Pinnacle Formation. Contact with overlying Cheshire Fm. is gradational.
CZfp
Quartzite member - rusty weathering, dark gray argillaceous quartzite and dark gray schist, occurs locally north of Christmas Hill Rd.CZfpq
Fairfield Pond Formation
Pinnacle FormationPinnacle Formation - light to medium gray, folaited to massive to pinstriped, muscovite-chlorite-biotite-feldspar-quartz schist, wacke and phyllite; commonly with blue quartz pebble conglomerate beds. Includes thick (up to 3 meters) bedded metawacke and quartzite, banded quartzite and pinstriped (1-2 mm) meatwacke and schist. Bedding is commonly transposed and two generations of pinstripes are evident. Interlayered with metavolcanic rocks and chlorite schist.
CZp
Quartzite member - Coarse- grained, massive conglomerate with rounded blue-quartz pebbles; includes medium grained, massive, thick (1-3 meter) bedded, light and dark gray banded quartzite (CZpqm)CZpq
CZpqm
Large cobble conglomerate member - poorly sorted cobble conglomerate in a chaotic dolomitic phyllite matrix. Cobbles include gneiss, quartzite, quartz, limestone, dolostone, slate and felsic igneous rock. Some clasts appear stretched; clasts decrease in size to the west within 5 meters. Occurs locally south of Johnnie Brook Road at east side of quadrangle.
CZpcg
Chlorite schist - rusty weathering, fine grained, medium green chlorite schist; interbedded with CZp and CZpv.CZpcsGreenstone member - rusty weathering, dark green, fine grained, epidote-albite-chlorite metavolcanic and calcareous greenstone; Interbedded with CZp.CZpv
Metawacke and schist member - light to dark gray and gray-green, fine to medium grained schist and striped schist with magnetite.CZps
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