legend - vermontdec.vermont.gov/sites/dec/files/geo/openfile/essexjunctionofr.pdf27 31 46 55 15 19...
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Williston
Essex
Richmond
Jericho
St. George
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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
1:24,000ScaleThe 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
! 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)
LegendLower Ordovician to Cambrian
Skeels Corners Slate - Dark gray to gray phyllite and laminated slate with thin (1-5 mm) orange-weathering dolomite layers.
Cambrian to Neoproterozoic
Cambrian
Clarendon Springs Formation - Light to dark gray, massive, granular, recrystallized dolostone and breccia with chert and dolostone clasts.
Danby Formation - Fine to medium grained, gray dolomitic sandstone, commonlywith visible rounded gray quartz sand grains.
Dunham Formation - Tan to brown weathering, buff to light gray, massively bedded dolostone.
Cheshire FormationCheshire Formation - Light to dark gray, massive, fine to medium grained quartzite and argillaceous quartzite.
Pinnacle Formation
Fairfield Pond Formation
Argillaceous quartzite member -fine to medium grained, gray and rusty weathering, dark gray argillaceous quartzite with abundant quartz veins.
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.
Metawacke and schist member - light to dark gray and gray-green, fine to medium grained schist and stripeed schist with magnetite.
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)
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.
Chlorite schist - rusty weathering, fine grained, medium green chlorite schist; interbedded with CZp and CZpv.
Greenstone member - rusty weathering, dark green, fine grained, epidote-albite-chlorite metavolcanic and calcareous greenstone; Interbedded with CZp.
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.
Quartzite member - rusty weathering, dark gray argillaceous quartzite and dark gray schist, occurs locally north of Christmas Hill Rd.
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