VT Sheet3back Table Final

Home , Bromley Mountain, Ludlow Mountain

U.S. DEPARTMENT OF THE INTERIOR Prepared in cooperation with the SCIENTIFIC INVESTIGATIONS MAP 3184 U.S. GEOLOGICAL SURVEY STATE OF VERMONT, VERMONT AGENCY OF NATURAL RESOURCES, BEDROCK GEOLOGIC MAP OF VERMONT MARCIA K. McNUTT, DIRECTOR VERMONT GEOLOGICAL SURVEY SHEET 3 OF 3 (BACK) LAURENCE R. BECKER, STATE GEOLOGIST

SOURCES OF GEOLOGIC MAP DATA

73° 22’ 30” 73° 72° 30’ 72° 71° 30’

A1. Agnew, P.C., 1977, Reinterpretation of the Hinesburg thrust in northwestern Vermont: D7. Doolan, B, Brooks, K., Copans, B., Hengstenberg, C., and Sonenberg, D., 1999, Bed- H14. Hewitt, P.C., and LaBrake, R.F., 1961, The geology of the Equinox quadrangle and vi- M21. Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, R22. Ratcliffe, N.M., and Armstrong, T.R., 2001, Bedrock geologic map of the Saxtons River T7. Thompson, P.J., and Thompson, T.B., 1995, Digital bedrock geologic map of parts of Burlington, Vt., University of Vermont, unpub. M.S. thesis, 82 p. rock geology of the Cold Hollow Mountains quadrangle, Vermont: Vermont Geologi- cinity, Vermont: Vermont Geological Survey Bulletin 18, 83 p., 6 pls., scale A.M., II, and Marvinney, R.G., 1995, Geologic map of the Sherbrooke-Lewiston 7.5' × 15' quadrangle, Windham and Windsor Counties, Vermont: U.S. Geological the Huntington, Richmond, Bolton and Waterbury quadrangles, Vermont: Vermont WEST HIGHGATE NEWPORT MORGAN NORTON MONADNOCK PITTSBURG SHELDON ENOSBURG D9 D9 AVERILL OE N. D4, L4, cal Survey Open-File Report VG99–4, 6 pls., scale 1:24,000. (Also available at 1:62,500. (Also available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) area, Maine, New Hampshire, and Vermont, United States, and Québec, Canada, Survey Geologic Investigations Series Map I–2636, 2 sheets, scale 1:24,000, includes Geological Survey Open-File Report VG95–9A, 2 pls., scale 1:24,000; VG95–9B, M10 D9 D9 D4 D4 CENTER OE N. D9 D9 RICHFORDD9, R28OE N. JAY PEAKC3, OED9 N. NEWPORT OE N. CENTER OE N. POND OE N. D4, M21, A2. Albee, A.L., 1957, Bedrock geology of the Hyde Park quadrangle, Vermont: U.S. Geo- D4, M10 SPRINGS OE N. FALLS OE N. NORTH TROY OE N. CENTER OE N. D4, M21, M22 MOUNTAINM22 OE N. M21, M22 http://www.anr.state.vt.us/dec/geo/ofreps.htm.) with Contributions to geochronology by J.N. Aleinikoff: U.S. Geological Survey Mis- pamphlet, 21 p. (Also available at http://ngmdb.usgs.gov/Prodesc/ database for part A. (Also available at http://www.anr.state.vt.us/dec/geo/ ROUSES POINT OE N. EAST ALBURG OE N. M10, S3, S4 CHARLESTON OE N. logical Survey Geologic Quadrangle Map GQ–102, scale 1:62,500. H15. Hoar, R.S., 1981, The bedrock geology of the Coventry area, Vermont: Burlington, Vt., QUEBEC,´ CANADA cellaneous Investigations Series Map I–1898–D, 2 sheets, scale 1:250,000, includes proddesc_42276.htm and http://pubs.usgs.gov/imap/2636/.) ofreps.htm.) 45° 45° D8. Doolan, Barry, Cherichetti, Lars, Holt, Jon, Ryan, Jeremy, Hengstenberg, Carey, and University of Vermont, unpub. M.S. thesis, 139 p. A3. Armstrong, T.R., 1993, Tectonic evolution of the Taconian hinterland, Granville- pamphlet, 56 p. Rosencrantz, Eric, 2003, Bedrock geology of the Underhill quadrangle, Vermont: R23. Ratcliffe, N.M., and Burton, W.C., 1989, Preliminary bedrock map of the Stratton T8. Thompson, P.J., and Thompson, T.B., 1997, unpublished data for the Mt. Mansfield, Hancock area, central Vermont: Burlington, Vt., University of Vermont, unpub. M.S. Vermont Geological Survey Open-File Report VG03–4B, scale 1:24,000. (Also avail- M22. Myers, P.B., Jr., 1964, Geology of the Vermont portion of the Averill quadrangle, Ver- Mountain quadrangle, Vermont: U.S. Geological Survey Open-File Report 89–200, 1 Jeffersonville, and Bolton Mountain 7.5-minute quadrangles, Vermont. WEST thesis, 199 p. J1. Johansson, W.I., 1963, Geology of the Lunenburg-Brunswick-Guildhall area, Vermont: NORTON AVERILL LOVERING able at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) mont: Vermont Geological Survey Bulletin 27, 69 p., 2 pls., including geologic map, pl., scale 1:24,000, includes pamphlet, 11 p. (Also available at HIGHGATE SHELDON NEWPORT MORGAN MONADNOCK CENTER ENOSBURG JAY PEAK NEWPORT POND D4, H5, MOUNTAIN Vermont Geological Survey Bulletin 22, 86 p., 3 pls., scale 1:62,500. (Also available T9. Thompson, P.J., and Thompson, T.B., 1998, Digital bedrock geologic map of the John- SPRINGS FALLS RICHFORD NORTH TROY CENTER CENTER MOUNTAIN D4, L4, ROUSESD4, POINT E3, EAST ALBURG D9, R28 CHARLESTON scale 1:62,500. (Also available at http://www.anr.state.vt.us/dec/geo/ bulletins.htm.) http://pubs.usgs.gov/of/1989/0200/ and http://ngmdb.usgs.gov/Prodesc/ D2, D9 C3, D6, D9 C3, D9, R29, D4, D9,H4, G6,H5 H5 M21, M22 D4, H5, L4, A4. Armstrong, T.R., and Ratcliffe, N.M., 1998, Digital and preliminary bedrock geologic D4, M10, M15 S3, S4 D2, D9, S1 S13, S14 D9, G6, H4 D4, D9, H4, D4, G9, H5 D4, G9, H5 M21, M22 D9. Doolan, B.L., Hatch, N.L., Jr., Thompson, P.J., Gale, M.H., and Kim, Jonathan, 2002, at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) son quadrangle, Vermont: Vermont Geological Survey Open-File Report VG98–2, 2 M10, M15 M10, M13, M15, M21, M22 map of the Townshend 7.5 × 15 minute quadrangle, Vermont: U.S. Geological Sur- proddesc_18947.htm.) unpublished data for the Mt. Mansfield 30 × 60 minute quadrangle, Vermont. pls., scale 1:24,000; VG98–2b, database for VG98–2. (Also available at vey Open-File Report 98–335–A, 1 sheet, scale 1:24,000; 98–335–B, digital data- O1. O’Loughlin, S.B., and Stanley, R.S., 1986, Bedrock geology of the Mount Abraham- R24. Ratcliffe, N.M., and Burton, W.C., 1996, Digital bedrock geologic map of the Weston http://www.anr.state.vt.us/dec/geo/ofreps.htm.) base for part A, 3 disks (3.5 inches). (Also available as Vermont Geological Survey D10. Dorsey, R.J., 1983, Geological synthesis of the Milton quadrangle, northwestern Ver- K1. Kim, J., 1997, Bedrock geologic map of parts of the Eden, Albany, Lowell, and Irasburg Lincoln Gap area, central Vermont: Vermont Geological Survey Special Bulletin 6, quadrangle, Vermont: U.S. Geological Survey Open-File Report 96–526–A, 2 pls., Open-File Reports VG98–335A and 335B at http://www.anr.state.vt.us/ mont; A new interpretation: Burlington, Vt., University of Vermont, unpub. B.S. the- quadrangles: Vermont Geological Survey Open-File Report VG97–5, 6 p., 2 pls., T10. Thompson, P.J., and Thompson, T.B., 1999, Digital bedrock geologic map of the Mt. NORTH HAZENS LOWELL 29 p., 3 pls., scale 1:12,000. (Also available at http://www.anr.state.vt.us/ scale 1:24,000; 96–526–B, digital database for part A, 2 disks (3.5 inches). (Part A HERO ORLEANS NOTCH IRASBURG SPECTACLEPOND BLOOMFIELD TINKERVILLE dec/geo/digitofr.htm.) sis, 103 p. scale 1:24,000. Mansfield quadrangle, Vermont: Vermont Geological Survey Open-File Report BEEKMAN- ST. ALBANS FAIRFIELD MTS. D4, D9, WESTMORE D4, H5, dec/geo/specbulls.htm.) is available at http://pubs.usgs.gov/of/1996/0526a/.) (Also available as Vermont TOWN D4, E3, ST. ALBANS BAY D2, D9 BAKERSFIELDD2, D9, COLD HOLLOW B1, B2, B6, C3, B1, B2, D4, ISLAND POND D4, H5, L4, D4, M10, M10, M13, B5, B6, C3, D9, H4, D4, G9, H5 D4, G9,H5 VG99–3, 3 pls., scale 1:24,000. (Also available at http://www.anr.state.vt.us/ D7, D9 C8, D9,H5, G1, K1, G2, D4, D9, H4, H5 M21, M22 M21, M22 M10, M15 M14, M15 M14, M15 M18, T3 C8, D9, G1, H5, K1 H4, H5, H15 Kim, Jonathan, Gale, Marjorie, King, S.M., Orsi, C.M., and Pascale, L.R., 2003, Bed- Geological Survey Open-File Reports VG96–526A and 526B at S13, S14 A5. Armstrong, T.R., 1994, Bedrock geology of the Moretown Formation, North River Ig- D11. Dorsey, R.J., Agnew, P.C., Carter, C.M., Rosencrantz, E.J., and Stanley, R.S., 1983, K2. D4, M10, M15 G2, G3, S2 O2. Osberg, P.H., 1959, The stratigraphy and structure of the Coxe Mountain area, Ver- dec/geo/ofreps.htm.) neous Suite and associated metasedimentary/metavolcanic rocks of the Connecticut Bedrock geology of the Milton quadrangle, northwestern Vermont: Vermont Geologi- rock geology of the Montpelier quadrangle, Vermont: Vermont Geological Survey http://www.anr.state.vt.us/dec/geo/ofreps.htm.) mont, trip F in New England Intercollegiate Geological Conference, 51st Annual Valley Belt, Brattleboro and Newfane [7.5 × 15 minute] quadrangles, Windham cal Survey Special Bulletin 3, 14 p., 4 pls., scales 1:24,000 and 1:62,500. (Also Open-File Report VG03–1, 1 pl., scale 1:24,000. (Also available at T11. Thompson, T.B., Thompson, Peter, and Doolan, Barry, 2004, Bedrock geologic map Meeting, Rutland, Vermont, 1959: p. 45–52. (Edited by E-an Zen.) R25. Ratcliffe, N.M., Potter, D.B., and Stanley, R.S., 1993, Bedrock geologic map of the Wil- County, Vermont: U.S. Geological Survey Open-File Report 94–247, 26 p., 2 pls., available at http://www.anr.state.vt.us/dec/geo/specbulls.htm.) http://www.anr.state.vt.us/dec/geo/ofreps.htm.) of the Hinesburg quadrangle, Vermont: Vermont Geological Survey Open-File Re- liamstown and North Adams quadrangles, Massachusetts and Vermont, and part of EDEN SOUTH GEORGIA MILTON scale 1:24,000. port VG04–2, 2 pls., scale 1:24,000, and geodatabase. (Also available at GILSON ALBANY CRYSTAL SENECA HERO PLAINS LAKE MAIDSTONELAKE D12. Dorsey, Rebecca, Doolan, Barry, Agnew, Paul, Carter, Craig, Rosencrantz, Eric, and K3. Kim, Jonathan, Gale, Marjorie, Thompson, Peter, and Derman, Karen, 2007, Bedrock the Cheshire quadrangle, Massachusetts: U.S. Geological Survey Miscellaneous Inves- JOHNSON A2, B1, B2, SUTTON STRATFORD PLATTSBURGH D4, E3, D4, D11, A1, C4, D10, MOUNTAIN CRAFTSBURY D4, D9, WEST BURKE MOUNTAIN P1. Platt, L.B., 1960, Structure and stratigraphy of the Cossayuna area New York: New http://www.anr. state.vt.us/dec/geo/ofreps.htm.) D11, D12, D5, D9 JEFFERSONVILLED9, M18,T8 A2, D9, T9 C8, D9, G1, B1, B2, C8, D9, D4, D9, D4, D9, D4, W18 D4, M10, M15 H4, H5 H4, H5 D4, W18 D4, J1, R4 D4, J1, L4, R4 A6. Armstrong, T.R., 1997, Preliminary bedrock geologic map of the Vermont part of the Stanley, Rolfe, 1995, Digital compilation bedrock geologic map of the Milton quad- geologic map of the town of Williston, Vermont: Vermont Geological Survey Open- tigations Series Map I–2369, scale 1:24,000. (Also available at M10, M15 M10, M15M12, M10, M15 G2, K1, K4 G1, G2,H5, H4, K1 H4, H5 Haven, Conn., Yale University, unpub. Ph.D. thesis, 126 p., 6 pls., scale 1:24,000. 7.5 × 15 minute Bellows Falls quadrangle, Windham and Windsor Counties, Ver- rangle, Vermont: Vermont Geological Survey Open-File Report VG95–8A, 2 pls., File Report VG07–4, 1 pl., scale 1:24,000. (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_10257.htm.) T12. Timms, N.E., 2004, The Piermont allochthon revisited and redefined at its type locality: mont: U.S. Geological Survey Open-File Report 97–284, 1 sheet, scale 1:24,000, scale 1:24,000; VG95–8B, database for part A. (Also available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) P2. Potter, D.B., 1972, Stratigraphy and structure of the Hoosick Falls area, New York- Geological Society of America Bulletin, v. 116, nos. 11–12, p. 1392–1407, R26. Ratcliffe, N.M., and Walsh, G.J., 1998, Digital and preliminary bedrock geologic map of includes variously paged pamphlet. http://www.anr.state.vt.us/dec/geo/ofreps.htm.) Vermont, east-central Taconics: New York State Museum and Science Service, Map doi:10.1130/B25365.1. K4. Kim, Jonathan, Springston, George, and Gale, Marjorie, 1998, Digital bedrock geologic the Mount Carmel quadrangle, Vermont: U.S. Geological Survey Open-File Report FACE and Chart Series 19, 71 p., includes geologic map, scale 1:24,000. ESSEX STONE MOUNT CASPIAN BURKE A7. Armstrong, T.R., 2008, unpublished data. map of the Eden quadrangle, Vermont: Vermont Geological Survey Open-File Report 98–330–A, 1 pl., scale 1:24,000; 98–330–B, digital database for part A, 3 disks (3.5 T13. Traverse, Alfred, 1955, Pollen analysis of the Brandon Lignite of Vermont: U.S. Bureau COLCHESTERPOINT CENTER WOLCOTT LAKE KEESEVILLE COLCHESTER WHITE STANNARD GROVETON UNDERHILL MANSFIELD D4, D9, D4, D9, LYNDONVILLED4, D9, MOUNTAIN GALLUP MILLS MOUNTAIN D4, E3, C6, D11, D8, D9 MOUNTAIN MORRISVILLE E1. Eiben, D.B., 1976, Stratigraphy and structure of the Stimson Mountain area, Camels VG98–3, 2 pls., scale 1:24,000; VG98–3B, database for VG98–3. (Also available at Prahl, C., 1985, The geology of the Middle Proterozoic rocks of the Lincoln massif of inches). (Also available as Vermont Geological Survey Open-File Reports VG98- of Mines Report of Investigations 5151, 107 p. (Also available at D4, D11, K5, A2, D9 A2, D9, S8 H4, H5 D4, D9, H4, H5 H4, H5 D4, W18 D4, R4, W18 D4, J1, R4 D4, J1, L4, R4 P3. D4, M10, M15 M10, M15 D9, T8, T10 H4, H5 A8. Aubrey, W.M., II, 1977, The structure and stratigraphy of the northern ridges of Camels M10, M15 M10, M15 Hump quadrangle, north central Vermont: Burlington, Vt., University of Vermont, http://www.anr.state.vt.us/dec/geo/ofreps.htm.) west-central Vermont and their suitability for long term storage of high level nuclear 330A and 330B at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) http://catalog.hathitrust.org/Record/005980348.) Hump Mountain, Camels Hump quadrangle, north central Vermont: Burlington, Vt., 44° 30’ 44° 30’ unpub. M.S. thesis, 112 p. waste: Burlington, Vt., University of Vermont, unpub. B.S. thesis, 42 p. 73° 30’ University of Vermont, unpub. M.S. thesis, 57 p. K5. Kim, Jonathan, and Thompson, Peter, 2001, Bedrock geologic map of the Colchester R27. Rathke, W.W., 1978, Structural relations of Taconic slices, southern Berlin Valley, New E2. Eric, J.H., and Dennis, J.G., 1958, Geology of the Concord-Waterford area, Vermont: quadrangle[, Vermont]: Vermont Geological Survey Open-File Report VG01–1, 3 pls., P4. Prewitt, J.M., 1989, Bedrock geology of the Warren-Granville Gulf area, central Ver- York: Ithaca, N.Y., Cornell University, unpub. M.S. thesis, 59 p., 2 pls., scale V1. Voight, Barry, 1965, The Sudbury nappe; Analysis of a parautochthon, unpub. manu- ESSEX Vermont Geological Survey Bulletin 11, 66 p., 2 pls., scale 1:62,500. (Also available scale 1:24,000. (Also available at http://www.anr.state.vt.us/ dec/geo/ofreps.htm.) mont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, 137 p. 1:24,000. script, 56 p., 3 maps, variable scale. Written communication to N.M. Ratcliffe, 2002. BOLTON JUNIPER STOWE MOUNT CABOT CONCORD MILES POND B1. Badger, R.L., 1977, Stratigraphy and origin of the Umbrella Hill Conglomerate: Burl- ISLAND BURLINGTON JUNCTION RICHMOND JOES POND MOUNTAIN C2, G5, WOODBURY D4, H4, ST. JOHNSBURYD4, H2, E2, H7, R1, B4, E2, R1, LANCASTER at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) D4, H3, K3, WORCESTER M7, M11, C6, C7, D4, E1, M2,T6, S12, T7 S7, S12 C2, S12 S12 D4, H2, H4, H4, H5, R2, R3, R4 R2, R3, R4 J1, L4, R4 ington, Vt., University of Vermont, unpub. M.S.A. thesis, 106 p. R28. Rosencrantz, E., Schoonmaker, A., Copans, B., Holt, J., Ryan, J., Talcott, J., and M11, W15M16, E1, S7, S12, D4, H4, H5, H5, S12 H5, S12 S12 K6. Kimball Falta, Christine, 1991, Tectonic geology of the Rochester-Hancock area, Roch- M16,W15 S15, K3, M11, M16 T6, T7, T8 E3. Erwin, R.B., 1957, The geology of the limestone of Isle La Motte and South Hero Is- R1. Rankin, D.W., 1994, Preliminary bedrock geologic map of parts of the Lower Water- Sonenberg, D., 1998, Bedrock geology of the Richford quadrangle, Franklin County, W1. Walsh, G.J., 1992, Bedrock geology of the Fayston-Buels Gore area, central Vermont: B2. Badger, R.L., 1979, Origin of the Umbrella Hill Conglomerate, north-central Vermont: ester quadrangle, central Vermont: Burlington, Vt., University of Vermont, unpub. land, Vermont: Vermont Geological Survey Bulletin 9, 94 p., 2 pls., scale 1:62,500. ford, Concord, Littleton, and Miles Pond 7 1/2-minute quadrangles, Vermont and Vermont: Vermont Geological Survey Open-File Report VG98–4, 45 p., 6 pls., scale Vermont Geological Survey Special Bulletin 13, 74 p., 4 pls., scale 1:24,000. (Also 71° 30’ American Journal of Science, v. 279, no. 6, p. 692–702, doi:10.2475/ajs. M.S. thesis, 248 p. (Also available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) New Hampshire: U.S. Geological Survey Open-File Report OF–94–410, 28 p., 3 1:24,000. available at http://www.anr.state.vt.us/dec/geo/specbulls.htm.) 279.6.692. K7. Kraus, J.F., 1989, Geology of the Northfield Mountains, central Vermont: Burlington, pls., scale 1:24,000. (Text also available at http://pubs.usgs.gov/of/ LOWER R29. Roy, D.L., 1982, The structure and stratigraphy of the Cambrian-Ordovician sequence W2. Walsh, G.J., 1998, Digital bedrock geologic map of the Vermont part of the Hartland BARNET LITTLETON Vt., University of Vermont, unpub. M.S. thesis, 145 p. 1994/0410/report.pdf.) MOUNT PHILO PEACHAM BETHLEHEM B3. Balk, Robert, 1956, Bedrock geology of the Massachusetts portion of the Northfield CHARLOTTE HINESBURG HUNTINGTON WATERBURY MIDDLESEX MONTPELIERC2, K2, PLAINFIELD MARSHFIELD WATERFORD L4, R4 in the ultramafic belt near Troy, Vermont: Burlington, Vt., University of Vermont, G4, G7, M9, C2, G5, R3, R4 F1. Fisher, D.W., 1985, Bedrock geology of the Glens Falls-Whitehall region, New York: quadrangle, Windsor County, Vermont: U.S. Geological Survey Open-File Report A8, S7, S12, S12 D4, H4,S12 H5, D4, H2, H4, D4, H2, H4, H5, B4, E2, R1, R2, M11, M16, D4, G7,M16, M11, S9, A8, S12,T7, W1T6, S7, S12 S12, W9 D4, H4, H5, H5, S12 S12 R3, R4 quadrangle, Massachusetts, New Hampshire, and Vermont: U.S. Geological Survey M11, M16, W15 T11 T6, T7, W1 M20, R3, R4, B4, E2, R1, R2, New York State Museum and Science Service, Map and Chart Series 35, 3 pls., scale R2. Rankin, D.W., 1996, Bedrock geology of the Littleton, Vermont-New Hampshire 15- unpub. M.S. thesis, 123 p. 98–123–A, 1 pl., scale 1:24,000, includes pamphlet, 17 p.; 98–123–B, digital data- S15, W15 Geologic Quadrangle Map GQ–92, scale 1:31,680. 1:48,000, includes pamphlet, 58 p. L1. Lapp, E.T., and Stanley, R.S., 1986, Bedrock geology of the Mt. Grant-South Lincoln minute quadrangle northwest of the Ammonoosuc fault, with a section on The ana- base for part A, 2 disks (3.5 inches). (Pamphlet also available at B4. Billings, M.P., 1937, Regional metamorphism of the Littleton-Moosilauke area, New area, central Vermont: Vermont Geological Survey Special Bulletin 7, 27 p., 3 pls., lytical methods and isotopic age investigation of pegmatitic metadiorite of the intru- http://pubs.usgs.gov/of/1998/0123a/.) (Also available as Vermont Geological Sur- F2. Fowler, Phillip, 1950, Stratigraphy and structure of the Castleton area, Vermont: Ver- S1. Schoonmaker, Adam, 1997, Stratigraphy and structure of the Enosburg Falls area; Impli- Hampshire: Geological Society of America Bulletin, v. 48, no. 4, p. 463–566. scale 1:12,000. (Also available at http://www.anr.state.vt.us/dec/geo/ sive suite of Comerford Dam, by Robert D. Tucker, in New England Intercollegiate vey Open-File Reports 98–123A and 123B at http://www.anr.state.vt.us/ mont Geological Survey Bulletin 2, 83 p., 2 pls., scale 1:62,500. (Also available at cations for extending geotectonic structures of Québec into Vermont: Burlington, Vt., KNOX specbulls.htm.) Geological Conference, 88th Annual Meeting, Mount Washington, N.H., September dec/geo/ofreps.htm.) BRISTOL GROTON VERGENNES VERGENNESEAST LISBON http://www.anr.state.vt.us/dec/geo/bulletins.htm.) University of Vermont, unpub. M.S. thesis, 206 p. WESTPORT WEST D3, D4, WAITSFIELD BARRE WEST BARRE EAST WOODSVILLE B5. Bothner, W.A., and Laird, Jo, 1987, Structure and metamorphism at Tillotson Peak, MOUNT ELLEN NORTHFIELD H4, H5, MOUNTAIN L4, R4 27, 28, and 29, 1996, Guidebook to field trips in northern New Hampshire and adja- M8, M11, D4, H4, H5, D4, H4, D4, H4, H5, H4, H5, M20, M11, W15M16, D3, S12,T1, S16,W1 H10, S12,H11, W1K7, S12, W16 S12, W9 S12, R19 S12, W17 north-central Vermont, in New England Intercollegiate Geological Conference, 79th L2. Lyons, J.B., 1955, Geology of the Hanover quadrangle, New Hampshire-Vermont: W3. Walsh, G.J., 2008, unpublished data. M11, M16, W15 M16, W15 M11, M16, T1 H5, S12 R4, S12, W17 F3. Frederick, Jeffrey, 1996, unpublished data for the Middlebury 7.5-minute quadrangle, cent regions of Maine and Vermont: Cambridge, Mass., Harvard University, p. 5–37. S2. Schoonmaker, Adam, 1998, Bedrock geology of the western 1/3 of the Hazens Notch Annual Meeting, Montpelier, Vermont, 1987, Guidebook for field trips in Vermont, Geological Society of America Bulletin v. 66, no. 1, p. 104–145, includes geologic Vermont. (Edited by M.R. Van Baalen.) 7.5 minute quadrangle, northern Vermont: Vermont Geological Survey Open-File Re- W4. Walsh, G.J., Armstrong, T.R., and Ratcliffe, N.M., 1996a, Digital bedrock geologic map v. 2: Northfield, Vt., Norwich University, p. 383–395. (Edited by D.S. Westerman.) map, scale 1:62,500, doi:0.1130/0016-7606(1955)66[105:GOTHQN]2.0.CO;2. port VG98–6, 2 pls., scale 1:24,000. of the Vermont part of the 7.5 × 15 minute Mount Ascutney and Springfield quad- B6. Bothner, W.A., and Laird, Jo, 1999, Geologic map of the Tillotson-Haystack area, Ha- L3. Lyons, J.B., 1958, Geology of the Hanover quadrangle[, New Hampshire-Vermont]: R3. Rankin, D.W., 1997, unpublished data for the Mt. Washington and Montpelier 30 × 60 rangles, Vermont: U.S. Geological Survey Open-File Report 96–733–A, 2 sheets, SOUTH EAST G1. Gale, M.H., 1980, Geology of the Belvidere Mountain Complex, Eden and Lowell, Ver- S3. Schoonmaker, Adam, 2005, Convergent and collisional tectonics in parts of Oregon, SNAKE LINCOLN WEST Concord, N.H., New Hampshire State Planning and Development Commission, 41 minute quadrangles. scale 1:24,000; 96–733–B, digital database for part A, 3 disks (3.5 inches). (Also MOUNTAIN WARREN ROXBURY CORINTH NEWBURY zens Notch and parts of the Lowell 7.5 minute quadrangles, Vermont: Vermont Geo- PORT HENRY MOUNTAIN MIDDLEBURYF3, G8, D1, D4, L1, BROOKFIELD TOPSHAM mont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, 169 p. Maine, and the Vermont-Québec border: Albany, N.Y., State University of New York G8, M11, G8, M11, O1, S10, WASHINGTOND4, H4, D4, H4, D4, L4, M19, p., includes geologic map, scale 1:62,500. available as Vermont Geological Survey Open-File Reports VG96–733A and 733B C10, M16,D1, M11, P3, A3, M6, P4, C11, M6,M4, S12M5, H4, H5, S12 D4, H4, H5, logical Survey Open-File Report VG99–5, 2 pls., scale 1:24,000. (Also available at M16, W15 M11, W15M16, S12, T1 S12, W8 H5, S12 H5, S12 R5, S12,W17 R4, R5, W17 T12, R4. Rankin, D.W., 2008, unpublished data. at Albany, unpub. Ph.D. dissertation, 218 p. M16, W15 S11, T1 http://www.anr.state.vt.us/dec/geo/ofreps.htm.) G2. Gale, M.H., 1986, Geologic map of the Belvidere Mountain area, Eden and Lowell, Ver- at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) L4. Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock 44° 44° mont: U.S. Geological Survey Miscellaneous Investigations Series Map I–1560, scale R5. Rankin, D.W., and Tucker, R.D., 2007, The Piermont allochthon revisited and redefined S4. Schoonmaker, Adam, and Kidd, W.S.F., 2007, A reappraisal of the allochthonous nature Brace, W.F., 1953, The geology of the Rutland area, Vermont: Vermont Geological Sur- geologic map of New Hampshire: Reston, Va., U.S. Geological Survey, 2 sheets, W5. Walsh, G.J., Armstrong, T.R., and Ratcliffe, N.M., 1996b, Preliminary bedrock geologic B7. 1:20,000. (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_9315.htm.) at its type locality—Discussion: Geological Society of America Bulletin, v. 119, nos. of the Rosenberg slice and the Stanbridge Group of southern Québec and northwest- vey Bulletin 6, 120 p., 3 pls., scale 1:31,680. (Also available at http://www.anr. scales 1:250,000 and 1:500,000. map of the Vermont part of the 7.5' × 15' Mount Ascutney and Springfield quad- (Supersedes USGS Open-File Report 80–978.) 3–4, p. 500–502, doi:10.1130/B26089. ern Vermont: Canadian Journal of Earth Sciences, v. 44, no. 2, p. 155–169, rangles, Windsor County, Vermont: U.S. Geological Survey Open-File Report 96–719, CROWN EAST FAIRLEE state.vt.us/dec/geo/bulletins.htm.) POINT PIERMONT L5. Lyttle, P.T., 1995, Digital bedrock geologic map of the Arlington quadrangle and Ver- doi:10.1139/e06-079. RANDOLPH W15 BRIDPORTW15 CORNWALL BREAD LOAF HANCOCK RANDOLPH CENTER CHELSEA VERSHIRE G3. Gale, M.H., and Kim, J., 1999, Compilation bedrock geologic map of the Hazens R6. Ratcliffe, N.M., 1992, Preliminary bedrock geologic map of the Mount Holly quad- 4 pls., scale 1:24,000, includes pamphlet, 36 p. (Pamphlet also available at NEW YORK C1, D4 A3, W3, D4, H5 D4, H5 D4, H5 D4, H1, H5, H1, L4,R4, M19, R5, MIDDLEBURY W14 H5, H8 T12 B8. Burton, W.C., 1991, Bedrock geologic map of the Woodford quadrangle, Bennington mont portion of the Shushan quadrangle, Vermont: U.S. Geological Survey Open- D4, W14 A3, D4, K6 M19, R4, R5 Notch quadrangle, Vermont: Vermont Geological Survey Open-File Report VG99–2, rangle, and portions of the Ludlow quadrangle, Rutland and Windsor Counties, Ver- S5. Segerstrom, Kenneth, 1956, Bedrock geology of the Colrain quadrangle, Massachu- http://pubs.usgs.gov/of/1996/719/.) and Windham Counties, Vermont: U.S. Geological Survey Geologic Quadrangle Map File Report 95–483–A, 2 pls., scale 1:24,000; 95–483–B, digital database for part 2 pls., scale 1:24,000. mont: U.S. Geological Survey Open-File Report 92–282–A, 16 p., 2 pls., scale setts-Vermont: U.S. Geological Survey Geologic Quadrangle Map GQ–86, scale A, 2 disks (3.5 inches). (Also available at http://pubs.usgs.gov/of/1995/0483a/.) W6. Walsh, G.J., and Falta, C.K., 1996, Digital bedrock geologic map of the Rochester GQ–1687, scale 1:24,000. 1:24,000.; 92–282–B, 5 slides. (Part A is also available at http://pubs.usgs.gov/ 1:31,680. (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_1017.htm.) G4. Gale, M.H., Kim, J., Earle, H., Clark, A., Smith, T., and Petersen, K., 2009, Bedrock (Also available as Vermont Geological Survey Open-File Reports VG95–483 and quadrangle, Vermont: U.S. Geological Survey Open-File Report 96–33–A, 2 sheets, B9. Burton, W.C., 1993, Bedrock geologic map of the Sunderland quadrangle, Bennington of/1992/0282a/.) HAMPSHIRE geologic map of Charlotte, Vermont: Vermont Geological Survey Open-File Report 483A at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) S6. Shumaker, R.C., and Thompson, J.B., Jr., 1967, Bedrock geology of the Pawlet quad- scale 1:24,000; 96–33–B, digital database for part A, 2 disks (3.5 inches). SOUTH SMARTS and Windham Counties, Vermont: U.S. Geological Survey Miscellaneous Field Stud- ORWELL MOUNT BETHEL SOUTH LYME VG09-5, 3 pls., scale 1:24,000. (Also available at http://www.anr.state.vt.us/ R7. Ratcliffe, N.M., 1993, Bedrock geologic map of the Mount Snow and Readsboro quadrangle, Vermont: Vermont Geological Survey Bulletin 30, 98 p., 2 pls., scale (Superseded by Walsh and Falta, 2001, map I–2626.) SUDBURY BRANDON SHARON MOUNTAIN M3, W15, V1, Z2 CARMEL ROCHESTER ies Map MF–2224, scale 1:24,000. (Also available at http://ngmdb. L6. Lyttle, P.T., unpublished data. Z1, Z2 O2, R19, ROYALTON D4, H5 STRAFFORDD4, H5 L4, M19,R5 TICONDEROGA O2, R26 K6, W6, W7 H5, R19, W3 H5, H6 D4, H1, H5, dec/geo/ofreps.htm.) rangles, Bennington and Windham Counties, Vermont: U.S. Geological Survey Mis- 1:62,500. (Also available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) W15, Z1 T13, V1 M19, R5 W7. Walsh, G.J., and Falta, C.K., 2001, Bedrock geologic map of the Rochester quadrangle, usgs.gov/Prodesc/proddesc_5858.htm.) cellaneous Investigations Series Map I–2307, 1 sheet, scale 1:24,000, includes pam- G5. Gale, M.H., Kim, J., King, S., Montane, P., and Orsi, C., 2006, Bedrock geologic map S7. Springston, George, 1997, Bedrock geology of the Stowe-Waterbury area, north-central Rutland, Windsor, and Addison Counties, Vermont: U.S. Geological Survey Geologic Burton, W.C., and Ratcliffe, N.M., 2000, Digital and preliminary bedrock geologic map M1. MacFadyen, J.A., Jr., 1956, The geology of the Bennington area, Vermont: Vermont phlet, 9 p. (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_ 72° B10. of the southern Worcester Mountains watershed, Middlesex and Stowe 7.5 minute Vermont: Vermont Geological Survey Open-File Report VG97–4, 23 p., 4 pls., scale Investigations Series Map I–2626, 1 sheet, scale 1:24,000, includes pamphlet, 14 p. NEW of the Wallingford quadrangle, Vermont: U.S. Geological Survey Open-File Report Geological Survey Bulletin 7, 72 p., 3 pls., scale 1:62,500. (Plates also available at 10234.htm.) (See also digital data in Ratcliffe, 1995c, Vermont Geological Survey quadrangles, Vermont: Vermont Geological Survey Open-File Report VG2006–2, 3 1:24,000. (Also available at http://www.anr.state.vt.us/dec/geo/ ofreps.htm.) (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_43379.htm; pamphlet 99–337–A, 1 sheet, scale 1:24,000; 99–337–B, digital database for part A, 3 disks http://www.anr.state.vt.us/dec/geo/bulletins.htm.) Open-File Report VG95–DM1.) pls., scale 1:24,000. (Also available at http://www.anr.state.vt.us/ also available at http://pubs.usgs.gov/imap/2626/report.pdf.) PUTNAMZ1 BENSON PROCTOR DELECTABLE WOODSTOCKNORTH QUECHEE HANOVER CANAANL4 (3.5 inches). (Also available at http://www.anr.state.vt.us/dec/geo/digitofr.htm.) S8. Springston, George, Kim, Jonathan, and Applegate, Scot, 1998, Digital bedrock geo- Z1, Z2 BOMOSEEN F2, O2, CHITTENDEN PICO W12PEAK Mallard, L.D., 2000, Stratigraphic structural, and fault history analyses of the Richmond Ratcliffe, N.M., 1994, [Note] 2. The Wilcox Formation of Vermont assigned to the F2, Z2, Z3 MOUNTAINW3 dec/geo/ofreps.htm.) M2. R8. R19, Z3 O2, R14, R15 D4, H5,L3, L2,T4 D4, L2, L3 logic map of the Morrisville quadrangle, Vermont: Vermont Geological Survey Open- W8. Walsh, G.J., Haydock, S., Prewitt, J., Kraus, J., Lapp, E., O’Loughlin, S., and Stanley, C5, D4,T4, H5,T5 7.5' quadrangle, north-central Vermont: Burlington, Vt., University of Vermont, Mount Holly Complex, in Stratigraphic notes, 1992: U.S. Geological Survey Bulletin G6. Gale, P.N., 1980, Geology of the Newport Center area, north central Vermont: Burling- File Report VG98–1, 2 pls., scale 1:24,000; VG98–1b, database for VG98–1. (Also R.S., 1995, Digital compilation bedrock geologic map of the Warren quadrangle, Cady, W.M., 1945, Stratigraphy and structure of west-central Vermont: Geological So- unpub. M.S. thesis, 157 p. 2060, p. 11–18, 1 pl., scale 1:48,000. (Also available at http://pubs.usgs.gov/ C1. ton, Vt., University of Vermont, unpub. M.S. thesis, 126 p. available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) Vermont: Vermont Geological Survey Open-File Report VG95–4A, 2 pls., scale ciety of America Bulletin, v. 56, no. 5, p. 515–587; pl. in pocket, scale 1:62,500. bul/2060/.) M3. Mango, Helen, 1997, Bedrock geologic map of the Orwell quadrangle[, Vermont]: Ver- 1:24,000; VG95–4B, database for part A. (Also available at G7. Gillespie, Richard, Stanley, Rolfe, Frank, Terry, and Barton, Thelma, 1972, Superposed S9. Stanley, R.S., 1969, Bedrock geology of the southern portion of the Hinesburg synclino- C2. Cady, W.M., 1956, Bedrock geology of the Montpelier quadrangle, Vermont: U.S. Geo- mont Geological Survey Open-File Report VG97–6, 1 pl., scale 1:24,000. (Also R9. Ratcliffe, N.M., 1995a, Digital bedrock geologic map of the Cavendish quadrangle, Ver- http://www.anr.state.vt.us/dec/geo/ofreps.htm.) WEST NORTH folds and structural chronology along the southeastern part of the Hinesburg syn- rium, trip C in New York State Geological Association, 41st Annual Meeting, Platts- RUTLAND KILLINGTONPEAK WOODSTOCKSOUTH HARTLAND mont: U.S. Geological Survey Open-File Report 95–203–A, 2 pls., scale 1:24,000; THORN HILL POULTNEY RUTLAND PLYMOUTH HARTLAND logical Survey Geologic Quadrangle Map GQ–79, scale 1:62,500. available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) WHITEHALLF1, Z1 B7, F2, L2, L3, F2, Z2, Z3 B7, R8, R16 clinorium, in New England Intercollegiate Geological Conference, 64th Annual Meet- burgh, New York, May 1969, Guidebook to field excursions: p. 37–64. (Edited by W9. Walsh, G.J., Kim, Jonathan, Gale, M.H., and King, S.M., 2010, Bedrock geologic map T2, R19, Z2 R8, W10, W11 D4, H5, T4, T4, W2 L2, L3, L4 95–203–B, digital database for part A, 2 disks (3.5 inches). (Part A is also available at R19, Z3 R8, R19, W11 T5, W3 ing, Burlington, Vermont, 1972, Guidebook for field trips in Vermont: p. 195–214. Martin, D.C., 1993, unpublished data for the Roxbury 7.5-minute quadrangle, Vermont. S.G. Barnett.) (Also available at http://www.nysga.net/files/32068470.pdf.) of the Montpelier and Barre West quadrangles, Washington and Orange Counties, C3. Cady, W.M., Albee, A.L., and Chidester, A.H., 1963, Bedrock geology and asbestos de- M4. http://pubs.usgs.gov/of/1995/0203a/.) 43° 30’ 43° 30’ posits of the upper Missisquoi Valley and vicinity, Vermont, chap. B of Contributions (Edited by B.L. Doolan and R.S. Stanley.) Vermont: U.S. Geological Survey Scientific Investigations Map 3111, 1 pl., scale M5. Martin, D.C., 1994, Geology of the Mississquoi Group and the Acadian orogeny in cen- S10. Stanley, R.S., DelloRusso, V., Haydock, S., Lapp, E., O’Loughlin, S., Prewitt, J., and to economic geology, 1960: U.S. Geological Survey Bulletin 1122, p. B–1 to B–78, R10. Ratcliffe, N.M., 1995b, Digital bedrock geologic map of the Chester quadrangle, Ver- 1:24,000, includes pamphlet, 36 p. (Also available at http://pubs.usgs.gov/ G8. Goldberg, J., and Mehrtens, C.J., 1994, Bedrock geology of the Port Henry and north- tral Vermont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, 247 p., 8 Tauvers, P.R., 1995, Digital compilation bedrock geologic map of the Lincoln quad- 1 pl., scale 1:62,500. (Also available at http://pubs.usgs.gov/bul/1122b/report.pdf mont: U.S. Geological Survey Open-File Report 95–576–A, 2 pls., scale 1:24,000; sim/3111/.) western portion of the Middlebury quadrangles: Vermont Geological Survey Open- pls. rangle, Vermont: Vermont Geological Survey Open-File Report VG95–5A, 2 pls., MOUNT and http://ngmdb.usgs.gov/Prodesc/proddesc_20823.htm.) 95–576–B, digital database for part A, 2 disks (3.5 inches). F1 WELLS LUDLOW FORT ANN GRANVILLE S6 B10 HOLLY CAVENDISH WINDSOR CLAREMONT File Report VG94–3, 21 p., 1 pl., scale 1:24,000. scale 1:24,000; VG95–5B, database for part A. (Also available at W10. Walsh, G.J., and Ratcliffe, N.M., 1994a, Digital bedrock geologic map of the Plymouth T2, R19 MIDDLETOWNSPRINGSS6 WALLINGFORD R9, R17 NORTHL4 M6. Martin, D.C., Cua, A.C., and Stanley, R.S., 1995, Digital compilation bedrock geologic R6, W13 R6, R8, W13 L4, W4, W5 C4. Carter, C.M., 1979, Interpretation of the Hinesburg thrust north of the Lamoille River, R11. Ratcliffe, N.M., 1995c, Digital bedrock geologic map of the Mount Snow and Reads- http://www.anr.state.vt.us/dec/geo/ofreps.htm.) quadrangle, Vermont: U.S. Geological Survey Open-File Report 94–654–A, 2 G9. Goodwin, B.K., 1963, Geology of the Island Pond area, Vermont: Vermont Geological map of the Roxbury quadrangle and eastern part of the Warren quadrangle, Vermont: northwestern Vermont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, boro quadrangles, Vermont: Vermont Geological Survey Open-File Report sheets, scale 1:24,000; 94–654–B, digital database for part A, 2 disks (3.5 inches). Survey Bulletin 20, 111 p., 3 pls., scale 1:62,500. (Also available at Vermont Geological Survey Open-File Report VG95–2A, 2 pls., scale 1:24,000; S11. Stanley, R.S., DelloRusso, V., Tauvers, P.R., DiPietro, J.A., Taylor, S., and Prahl, C., 84 p. VG95–DM1, 1 diskette, scale 1:24,000. (Also available at (Also available as Vermont Geological Survey Open-File Reports VG94–654A and http://www.anr.state.vt.us/dec/geo/bulletins.htm.) VG95–2B, database for part A. 1995, Digital compilation bedrock geologic map of the South Mountain quadrangle, http://www.anr.state.vt.us/dec/geo/ofreps.htm.) (Supplements Ratcliffe, 1993, 654B at http://www.anr.state.vt.us/dec/geo/digitofr.htm.) C5. Chang, P.H., Ern, E.H., Jr., and Thompson, J.B., Jr., 1965, Bedrock geology of the Vermont: Vermont Geological Survey Open-File Report VG95–3A, 2 pls., scale M7. Mehrtens, C.J., 1996a, unpublished data for the Burlington 7.5-minute quadrangle, U.S. Geological Survey Miscellaneous Investigations Series Map I–2307.) WEST 1:24,000; VG95–3B, database for part A. (Also available at http://www.anr. W11. Walsh, G.J., and Ratcliffe, N.M., 1994b, Preliminary bedrock geologic map of the Plym- F1 DANBY CHESTER CLAREMONT Woodstock quadrangle, Vermont: Vermont Geological Survey Bulletin 29, 65 p., 2 HARTFORD PAWLET PAWLETS6 DORSETS6 WESTON ANDOVERR12 SPRINGFIELD SOUTH Hadley, J.B., 1950, Geology of the Bradford-Thetford area, Orange County, Vermont: Vermont. S17 R19 R24 R10, R18 L4 H1. L4, W4, W5 pls., scale 1:62,500. (Also available at http://www.anr.state.vt.us/ R12. Ratcliffe, N.M., 1996, Digital bedrock geologic map of the Andover quadrangle, Ver- state.vt.us/dec/geo/ofreps.htm.) outh quadrangle and eastern portion of the Killington Peak quadrangle, Windsor and Vermont Geological Survey Bulletin 1, 36 p., 2 pls. (Also available at dec/geo/bulletins.htm.) Mehrtens, C.J., 1996b, unpublished data for the Monkton Boro 7.5-minute quadrangle, mont: U.S. Geological Survey Open-File Report 96–31–A, 2 pls., scale 1:24,000; Rutland Counties, Vermont: U.S. Geological Survey Open-File Report 94–225–A, http://www.anr.state.vt.us/dec/geo/bulletins.htm.) M8. S12. Stanley, R.S., Hatch, N.L., Jr., Thompson, P.J., Gale, M.H., and Walsh, G.J., 2002, un- Vermont. 96–31–B, digital database for part A. (Part A is also available at 36 p., 1 sheet, scale 1:24,000; 94–225–B, 6 colored slides. C6. Cherichetti, L.C., 1995, Stratigraphy and structural geology of the Pinnacle Formation published data for the Montpelier 30 × 60 minute quadrangle. H2. Hall, L.M., 1959, The geology of the St. Johnsbury quadrangle, Vermont and New http://pubs.usgs.gov/of/1996/0031a/.) (Report is also available as Vermont Geo- between the Lamoille and Winooski Rivers, northwestern Vermont: Vermont Geo- Mehrtens, C.J., 1996c, unpublished data for the Mount Philo 7.5-minute quadrangle, W12. Walsh, G.J., and Ratcliffe, N.M., 1998, Digital and preliminary bedrock geologic map Hampshire: Vermont Geological Survey Bulletin 13, 105 p., 5 pls., including geo- M9. logical Survey Open-File Reports VG96–31A and 31B; both parts are at S13. Stanley, R.S., and Roy, D., 1997, Digital bedrock geologic map of part of the Serpen- WEST logical Survey Open-File Report VG95–1, 10 p., 3 pls., scale 1:24,000. (Also avail- Vermont. of the Pico Peak quadrangle, Vermont: U.S. Geological Survey Open-File Report SALEM PERU logic map, scale 1:62,500. (Also available at http://www.anr.state.vt.us/ http://www.anr.state.vt.us/dec/geo/ofreps.htm.) tine belt, Lowell and North Troy quadrangles, Vermont: Vermont Geological Survey P1 RUPERT R19 WINDHAM ALSTEAD COSSAYUNA MANCHESTERH14, L6 R19 A6, L4 able at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) 98–226–A, 1 sheet, scale 1:24,000; 98–226–B, digital database for part A, 3 disks L6, P1, S17 H14, L6 LONDONDERRY R20, R22 SAXTONSR20, RIVER R22 BELLOWS FALLS A6, A7, L4 dec/geo/bulletins.htm.) Mehrtens, C.J., 1996d, Digital compilation bedrock geologic map of the Lake Cham- Open-File Report VG97–04A, 2 pls., scale 1:24,000; VG97–04B, database for part M10. R13. Ratcliffe, N.M., 1997a, Bedrock geologic map of the Jamaica and part of the Towns- (3.5 inches). (Also available at http://www.anr.state.vt.us/dec/geo/digitofr.htm.) C7. Cherichetti, L.C., 1996, Lithostratigraphy, deposition, and rift model analysis of the plain North one-degree sheet, Vermont: Vermont Geological Survey Open-File Re- A; VG97–04C, bedrock geologic map of the Jay and North Troy area, Vermont, 10 H3. Handy, J., 1975, unpublished data for the Burlington 7.5-minute quadrangle, Vermont. hend quadrangles, Windham and Bennington Counties, Vermont: U.S. Geological pls., supersedes part A. (Also available at http://www.anr.state.vt.us/dec/geo/ W13. Walsh, G.J., Ratcliffe, N.M., Dudley, J.B., and Merrifield, Thomas, 1994, Digital bed- Pinnacle Formation between the Lamoille and Winooski Rivers in northwestern Ver- port VG96–02A, 2 pls., scale 1:100,000; VG96–02B, database for part A. (Also Survey Miscellaneous Investigations Series Map I–2453, 2 pls., scale 1:24,000. (Also ofreps.htm.) rock geologic map of the Mount Holly and Ludlow quadrangles, Vermont, and expla- mont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, 122 p. H4. Hatch, N.L., Jr., unpublished data for the eastern half of the Montpelier and Mt. Mans- available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) available at http://ngmdb.usgs.gov/Prodesc/proddesc_13037.htm.) field 30 × 60 minute quadrangles. nation of the bedrock geology database in the Vermont Geographic Information Sys- C8. Chidester, A.H., Albee, A.L., and Cady, W.M., 1978, Petrology, structure, and genesis M11. Mehrtens, C.J., 1997, Digital compilation bedrock geologic map of the Lake Champlain S14. Stanley, R.S., Roy, D.L., Hatch, N.L., Jr., and Knapp, D.A., 1984, Evidence for tectonic SHUSHAN STRATTON GILSUM Ratcliffe, N.M., 1997b, Digital and preliminary bedrock geologic map of the Chittenden tem, 1994: U.S. Geological Survey Open-File Report 94–229–A, 3 sheets, scale M17 ARLINGTONL5 B9 JAMAICAR13 WEST WALPOLE R14. CAMBRIDGE SUNDERLAND TOWNSHEND WESTMINSTER A7, L4 A7, L4 emplacement of ultramafic and associated rocks in the pre-Silurian eugeoclinal belt of H12, L5, P1 MOUNTAIN A4, R13 A4 of the asbestos-bearing ultramafic rocks of the Belvidere Mountain area in Vermont: H5. Hatch, N.L., Jr., 1985–1991, unpublished data. South one-degree sheet, Vermont: Vermont Geological Survey Open-File Report R19, R23 quadrangle, Vermont: U.S. Geological Survey Open-File Report 97–854–A, 1 pl., 1:24,000; 94–229–B, digital database for part A, 2 disks (3.5 inches). (Also available U.S. Geological Survey Professional Paper 1016, 95 p., 4 pls., scale 1:12,000. (Also VG97–01A, 2 pls., scale 1:100,000; VG97–01B, database for part A. (Also avail- western New England; Vestiges of an ancient accretionary wedge: American Journal H6. Hatch, N.L., Jr., 1989, Reconnaissance bedrock geologic map of the South Royalton scale 1:24,000; 97–854–B, digital database for part A, 2 disks (3.5 inches). (Also as Vermont Geological Survey Open-File Reports VG94–229A and 229B at 43° 43° available at http://pubs.usgs.gov/pp/1016/.) able at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) of Science, v. 284, nos. 4–5, p. 559–595, doi:10.2475/ajs.284.4-5.559. quadrangle, Vermont: U.S. Geological Survey Open-File Report 89–288, 8 p., 1 pl., available as Vermont Geological Survey Open-File Reports VG97–854A and 854B http://www.anr.state.vt.us/dec/geo/digitofr.htm.) (Superseded in 1997 by a revised C9. Chidester, A.H., Hatch, N.L., Jr., Osberg, P.H., Norton, S.A., and Hartshorn, J.H., scale 1:24,000. (Also available at http://ngmdb.usgs.gov/Prodesc/ M12. Mehrtens, C.J., and Borre, M.A., 1989, Stratigraphy and bedrock geology of parts of at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) S15. 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(Also available EAGLEP2, BRIDGE R19 BENNINGTOND4, M1 R21 A5, H13 rangle, Rutland County, Vermont: U.S. Geological Survey Open-File Report ican Iapetus margin, Lincoln massif, central Vermont; An open and shut case: Burl- R7, R11 A5, D4, H13 D4, P2, R19 Guidebook for field trips in Vermont: p. 117–149. (Edited by B.L. Doolan and R.S. vey Geologic Quadrangle Map GQ–642, scale 1:24,000. at http://www.anr.state.vt.us/dec/geo/specbulls.htm.) 97–703, 36 p., 3 pls., scale 1:24,000. (Also available at http://pubs.usgs.gov/ ington, Vt., University of Vermont, unpub. M.S. thesis, 235 p. H7. Hatch, N.L., Jr., 1990, Reconnaissance bedrock geologic map of the rocks northwest Stanley.) Mehrtens, C.J., and Dorsey, R.J., 1987, Stratigraphy and bedrock geology of the north- of/1997/0703/.) C10. Condon, R., and Harding, L., 1996, unpublished data for the South Mountain 7.5- of the Monroe fault, Concord quadrangle, Vermont: U.S. Geological Survey Open- M13. W15. Welby, C.W., 1961, Bedrock geology of the central Champlain Valley of Vermont: Ver- minute quadrangle, Vermont. File Report 90–283, 11 p., 1 pl., scale 1:24,000. (Also available at western portion of the St. Albans quadrangle and the adjacent Highgate Center quad- S16. Stanley, R.S., Walsh, G.J., Tauvers, P.R., DiPietro, J.A., and DelloRusso, V., 1995, R16. Ratcliffe, N.M., 1998, Digital and preliminary bedrock geologic map of the Rutland mont Geological Survey Bulletin 14, 296 p., 5 pls., scale 1:62,500. (Also available http://ngmdb.usgs.gov/Prodesc/proddesc_17899.htm and http://pubs.usgs.gov/ rangle, Vermont: Vermont Geological Survey Special Bulletin 9, 28 p., 3 pls., scales Digital compilation bedrock geologic map of the Mt. Ellen quadrangle, Vermont: Ver- NORTH C11. Cua, A.K., 1989, Geology and geochemistry of metabasaltic rocks from the Roxbury quadrangle, Vermont: U.S. Geological Survey Open-File Report 98–121–A, 1 pl., at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) GRAFTON POWNAL GOVERNORS of/1990/0283/report.pdf.) 1:12,000 and 1:24,000. (Also available at http://www.anr.state.vt.us/dec/geo/ mont Geological Survey Open-File Report VG95–6A, 2 pls., scale 1:24,000; POWNAL STAMFORD H13 HINSDALEL4 P2, R19 D4, M1 READSBORO R21 MOUNTAIN BRATTLEBORO area, central Vermont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, scale 1:24,000; 98–121–B, digital database for part A, 2 disks (3.5 inches). (Also D4, M1, R19 R7, R11 JACKSONVILLE A5, H13 specbulls.htm.) VG95–6B, database for part A. (Also available at http://www.anr.state.vt.us/ W16. Westerman, David, 1994, Bedrock geologic map of the Northfield 7.5 minute quad- D4, P2, R19 available as Vermont Geological Survey Open-File Reports VG98–121A and 121B 256 p. H8. Hatch, N.L., Jr., 1991, Reconnaissance bedrock geologic map of the Randolph Center dec/geo/ofreps.htm.) rangle, Vermont: Vermont Geological Survey Open-File Report VG94–4, 1 pl., scale at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) quadrangle, Vermont: U.S. Geological Survey Open-File Report 91–275, 8 p., 1 pl., M14. Mehrtens, C.J., and Hadley, A.C.H., 1995, Bedrock geology of parts of the St. Albans 1:24,000. (Also available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) 73° 30’ scale 1:24,000. (Also available at http://ngmdb.usgs.gov/Prodesc/ and Georgia 7.5' quadrangles[, northwestern Vermont]: Vermont Geological Survey S17. Steuer, M.R., 1982, Structural geology of the Salem area, New York: Bryn Mawr, Pa., MASSACHUSETTS DelloRusso, Vincent, and Stanley, R.S., 1986, Bedrock geology of the northern part of R17. Ratcliffe, N.M., 2000a, Bedrock geologic map of the Cavendish quadrangle, Windsor D1. proddesc_18102.htm, http://pubs.usgs.gov/of/1991/0275/report.pdf, and Special Bulletin 14, 18 p., 1 pl., scale 1:24,000. (Also available at Bryn Mawr College, unpub. Ph.D. thesis, 94 p., 3 pls., scale 1:24,000. W17. White, W.S., and Billings, M.P., 1951, Geology of the Woodsville quadrangle, Vermont- the Lincoln Massif, central Vermont: Vermont Geological Survey Special Bulletin 8, County, Vermont: U.S. Geological Survey Geologic Quadrangle Map GQ–1773, http://pubs.usgs.gov/of/1991/0275/report.pdf.) http://www.anr.state.vt.us/dec/geo/specbulls.htm.) New Hampshire: Geological Society of America Bulletin, v. 62, no. 6, p. 647–696, BERLIN NORTH ROWE HEATH 1 pl., scale 1:24,000, includes pamphlet, 19 p. (Also available at C9 H9 COLRAIN NORTHFIELDB3, D4, 56 p., 4 pls., scales 1:12,000 and 1:24,000. (Also available at R25 ADAMS D4, S5 BERNARDSTOND4, Z4 3 pls., including geologic map, scale 1:62,500, doi:10.1130/0016- D4, R27, Z4 WILLIAMSTOWN R25 L4, Z4 http://ngmdb.usgs.gov/ Prodesc/proddesc_33543.htm.) T1. Tauvers, P.R., 1982, Bedrock geology of the Lincoln area, Vermont: Vermont Geologi- http://www.anr.state.vt.us/dec/geo/specbulls.htm.) H9. Hatch, N.L., Jr., and Hartshorn, J.H., 1968, Geologic map of the Heath quadrangle, M15. Mehrtens, C.J., Doolan, B.L., Gale, M.H., Stanley, R.S., and Thompson, P.J., 2000, 7606(1951)62[647:GOTWQV]2.0.CO;2. Massachusetts-Vermont: U.S. Geological Survey Geologic Quadrangle Map unpublished data for the Lake Champlain North 30 × 60 minute quadrangle. cal Survey Special Bulletin 2, 8 p., 1 pl., scale 1:24,000. (Also available at 42° 37’ 30” 42° 37’ 30” Dennis, J.G., 1964, The geology of the Enosburg area, Vermont: Vermont Geological R18. Ratcliffe, N.M., 2000b, Bedrock geologic map of the Chester quadrangle, Windsor D2. GQ–735, scale 1:24,000. (Also available at http://ngmdb.usgs.gov/Prodesc/ http://www.anr.state.vt.us/dec/geo/specbulls.htm.) W18. Woodland, B.G., 1965, The geology of the Burke quadrangle, Vermont: Vermont Geo- 73° 22’ 30” 73° 72° 30’ Survey Bulletin 23, 56 p., 3 pls., scale 1:62,500. M16. Mehrtens, C.J., Stanley, R.S., Gale, M.H., and Thompson, P.J., 2000, unpublished data County, Vermont: U.S. Geological Survey Geologic Investigations Series Map proddesc_2042.htm.) logical Survey Bulletin 28, 151 p., 5 pls., including geologic map, scale 1:62,500. for the Lake Champlain South 30 × 60 minute quadrangle. I–2598, 1 pl., scale 1:24,000, includes pamphlet, 16 p. (Also available at T2. Theokritoff, George, 1984, Taconic stratigraphy in northern Washington County, New D3. DiPietro, J.A., 1983, Geology of the Starksboro area, Vermont: Vermont Geological (Also available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) SCALE 1:700 000 H10. Haydock, S.R., 1988, Tectonic geology of the Waitsfield-Warren area, central Vermont: http://ngmdb.usgs.gov/Prodesc/proddesc_33542.htm.) York: Geological Society of America Bulletin, v. 73, no. 3, p. 171–190. Survey Special Bulletin 4, 14 p., 2 pls., scale 1:24,000. (Also available at M17. Metz, R., 1980, Geologic map of the Cambridge quadrangle, New York: New York 10 0 10 20 30 MILES Burlington, Vt., University of Vermont, unpub. M.S. thesis, 209 p. R19. Ratcliffe, N.M., 1990–2008, unpublished data. T3. Thompson, P.J., 1975, Stratigraphy and structure of Shattuck Ridge, Bakersfield and http://www.anr.state.vt.us/dec/geo/specbulls.htm.) State Geological Survey, Open-File Map 1g 081, scale 1:24,000. Z1. Zen, E-an, 1959, unpublished data on the Taconic sequence and Lake Champlain, H11. Haydock, S.R., and Walsh, G.J., 1996, Digital compilation bedrock geologic map of the Waterville, Vermont: Burlington, Vt., University of Vermont, unpub. M.S. thesis, 68 p. 10 0 10 20 30 40 KILOMETERS Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial geo- M18. Mock, T.D., 1989, Bedrock geology of the East Fletcher-Bakersfield area, northern Ver- R20. Ratcliffe, N.M., and Armstrong, T.R., 1996, Digital bedrock geologic map of the Sax- west-central Vermont. D4. western part of the Waitsfield quadrangle, Vermont: Vermont Geological Survey logic map of Vermont: [Montpelier,] Vermont Geological Survey, scale 1:250,000. mont: Vermont Geological Survey Special Bulletin 10, 28 p., 3 pls., scale 1:12,000. tons River 7.5 × 15 minute quadrangle, Vermont: U.S. Geological Survey Open-File T4. Thompson, P.J., 2006, Bedrock geologic map of Woodstock, Vermont: Vermont Geo- Open-File Report VG96–3A, 2 pls., scale 1:24,000; VG96–3B, database for part A. Z2. Zen, E-an, 1961, Stratigraphy and structure at the north end of the Taconic Range in (Also available at http://www.anr.state.vt.us/dec/geo/centmap.htm.) (Also available at http://www.anr.state.vt.us/dec/geo/specbulls.htm.) Report 96–52–A, 2 pls., scale 1:24,000; 96–52–B, digital database for part A, 4 logical Survey Open-File Report VG06–4, 4 pls., scale 1:24,000. (Also available at (Also available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) west-central Vermont: Geological Society of America Bulletin, v. 72, no. 2, p. disks (3.5 inches). (Part A is also available at http://pubs.usgs.gov/of/ http://www.anr.state.vt.us/dec/geo/ofreps.htm.) Doolan, Barry, 1995, Digital bedrock geologic map of the Gilson Mountain 7.5 minute M19. Moench, R.H., 1990, The Piermont allochthon, northern Connecticut Valley area, New 293–338, includes geologic map, scale 1:48,000, doi:10.1130/00167606(1961) D5. H12. Hayes, C.G., 1978, The geology of the Shushan quadrangle, New York-Vermont: 1996/0052a/.) (Also available as Vermont Geological Survey Open-File Reports quadrangle, Vermont: Vermont Geological Survey Open-File Report VG95–7A, 2 England—Preliminary description and resource implications, chap. J of Slack, J.F., T5. Thompson, P.J., 2008, unpublished data. 72[293:SASATN]2.0.CO;2. Ithaca, N.Y., Cornell University, unpub. M.S. thesis, 58 p., 3 pls., scale 1:24,000. VG96–52A and 52B at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) INDEX TO GEOLOGIC MAPPING pls., scale 1:24,000. (Also available at http://www.anr.state.vt.us/ ed., Summary results of the Glens Falls CUSMAP Project, New York, Vermont, and T6. Thompson, P.J., and Thompson, T.B., 1992, Bedrock geology of the Camels Hump- Z3. Zen, E-an, 1964, Stratigraphy and structure of a portion of the Castleton quadrangle, Hepburn, J.C., Trask, N.J., Rosenfeld, J.L., and Thompson, J.B., Jr., 1984, Bedrock New Hampshire: U.S. Geological Survey Bulletin 1887, p. J1–J23. (Also available at R21. Ratcliffe, N.M., and Armstrong, T.R., 1999, Bedrock geologic map of the West Dover BY 7.5-MINUTE QUADRANGLE dec/geo/ofreps.htm.) H13. Bolton Mountain area, north-central Vermont: Vermont Geological Survey Special Vermont: Vermont Geological Survey Bulletin 25, 70 p., 2 pls., scale 1:48,000. geology of the Brattleboro quadrangle, Vermont-New Hampshire: Vermont Geologi- http://pubs.usgs.gov/bul/1887/.) and Jacksonville quadrangles, Windham County, Vermont: U.S. Geological Survey [Alphanumeric designations under quadrangle names are keyed to Sources of Geologic Map Data at right. D6. Doolan, Barry, comp., 1999, Compilation bedrock geologic map of the Jay Peak quad- Bulletin 12, 32 p., 4 pls., scale 1:24,000. (Also available at http://www.anr. (Also available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) cal Survey Bulletin 32, 162 p., 2 pls., including geologic map, scale 1:62,500. (Also Miscellaneous Investigations Series Map I–2552, 2 pls., scale 1:24,000, includes ´ rangle, Vermont: Vermont Geological Survey Open-File Report VG99–1, 1 pl., scale M20. Moench, R.H., 2001, unpublished data for the Barnet and Woodsville 7.5-minute quad- state.vt.us/dec/geo/specbulls.htm.) The “OE N” in the names of the northern tier of quadrangles along the border with Quebec stands available at http://www.anr.state.vt.us/dec/geo/bulletins.htm.) pamphlet, 30 p. (Also available at http://pubs.usgs.gov/imap/2552/ and Z4. Zen, E-an, ed., Goldsmith, Richard, Ratcliffe, N.M., Robinson, Peter, and Stanley, R.S., for “overedge north”. Topographic maps are available at the USGS Store (http://store.usgs.gov).] 1:24,000. (Also available at http://www.anr.state.vt.us/dec/geo/ofreps.htm.) rangles, Vermont. http://ngmdb.usgs.gov/Prodesc/proddesc_22689.htm.) compilers, 1983, Bedrock geologic map of Massachusetts: Reston, Va., U.S. Geo- logical Survey, 3 sheets, scale 1:250,000. (Also available at http://ngmdb.usgs.gov/ Prodesc/proddesc_16357.htm.)

Table 1.—Summary of uranium-lead (U-Pb) zircon ages of rocks from Vermont. [Sample numbers are shown on the map and on the geologic structure map] REFERENCES CITED IN TABLE 1 Sample Map Unit Map Sheet Description Age Reference (see References Cited for this table) [These references are also included in the References Cited that follow the Description of Map Units on the front of this sheet] 1 1 Y dg South Hornblende diorite gneiss at South Londonderry 1,393 ± 9 Ma Aleinikoff and others (2011) Aleinikoff, J.N., and Karabinos, Paul, 1990, Zircon U-Pb data for the Moretown and McWilliams, C.K., Walsh, G.J., and Wintsch, R.P., 2010, Silurian-Devonian age and 1 Barnard Volcanic Members of the Missisquoi Formation and a dike cutting the tectonic setting of the Connecticut Valley-Gaspé trough in Vermont based on U-Pb 2 Y bm South Baileys Mills tonalitic gneiss in the Chester dome 1,383 ± 13 Ma Aleinikoff and others (2011) Standing Pond Volcanics, southeastern Vermont, chap. D of Slack, J.F., ed., SHRIMP analyses of detrital zircons: American Journal of Science, v. 310, no. 5, p. 3 Y1rt South Rawsonville trondhjemite gneiss at Bromley Mountain 1,367 ± 16 Ma Ratcliffe and others (1991); Aleinikoff and others (2011) Summary results of the Glens Falls CUSMAP Project, New York, Vermont, and New 325–363; doi: 10.2475/05.2010.01. Hampshire: U.S. Geological Survey Bulletin 1887, p. D1–D10. (Also available at Moench, R.H., and Aleinikoff, J.N., 2003, Stratigraphy, geochronology, and 4 Y1fga South Felchville Gneiss (aplitic facies) at Cavendish Gorge 1,372 ± 11 Ma Aleinikoff and others (2011) http://pubs.usgs.gov/bul/1887/.) accretionary terrane settings of two Bronson Hill arc sequences, northern New 73° 72° 1 5 Y fg South Felchville Gneiss (trondhjemite facies) at Felchville 1,370 ± 11 Ma Aleinikoff and others (2011) Aleinikoff, J.N., Ratcliffe, N.M., and Walsh, G.J., 2011, Provisional zircon and England [part II]: Physics and Chemistry of the Earth, v. 28, nos. 1–3, p. 113–160, QUEBEC,´ CANADA monazite uranium-lead geochronology for selected rocks from Vermont: U.S. doi:10.1016/S1474-7065(03)00012-3. 45° 1 Geological Survey Open-File Report 2011–1309, 46 p., available only online at 6 Y rta South Aplite facies of Rawsonville trondhjemitic gneiss, previously assigned to Bondville trondhjemitic gneiss 1,348 ± 3 Ma Ratcliffe and others (1991) Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., http://pubs.usgs.gov/of/2011/1309. LAKE 6B Y2bv South Bondville metadacite at Winhall River bridge 1,342 Ma Ratcliffe and others (1991); Aleinikoff and others (2011) Hussey, A.M., II, and Marvinney, R.G., 1995, Geologic map of the CHAMPLAIN MOUNT MANSFIELD Black, L.P., Kamo, S.L., Allen, C.M., Davis, D.W., Aleinikoff, J.N., Valley, J.W., Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, 2 NORTH Doolan 7 Y cp South Cole Pond tonalite gneiss 1,321 ± 9 Ma Ratcliffe and others (1991); Aleinikoff and others (2011) Mundil, Roland, Campbell, I.H., Korsch, R.J., Williams, I.S., and Foudoulis, Chris, and Québec, Canada, with Contributions to geochronology by J.N. Aleinikoff: U.S. GROVETON 2004, Improved 206Pb/238U microprobe geochronology by the monitoring of a Geological Survey Miscellaneous Investigations Series Map I–1898–D, 2 sheets, Doolan Gale 2 Rankin 8 Y mig South Migmatitic gneiss at Stratton Mountain 1,326 ± 4 Ma Aleinikoff and others (2011) trace-element-related matrix effect; SHRIMP, ID-TIMS, ELA-ICP-MS and oxygen scale 1:250,000, includes pamphlet, 56 p. Gale Hatch isotope documentation for a series of zircon standards: Chemical Geology, v. 205, 2 Rankin, D.W., and Tucker, R.D., 2000, Monroe fault truncated by Mesozoic (?) Ratcliffe 9 Y lgg South Fine-grained granodiorite at Ludlow Mountain 1,309 ± 6 Ma Aleinikoff and others (2011) nos. 1–2, p. 115–140. Mehrtens Kim 2 Connecticut Valley rift system at Bradford, VT; Relationship to the Piermont allochthon Stanley 10 Y lq South Okemo Quartzite; detrital zircons ~1,261 to 1,359 Ma Aleinikoff and others (2011) Hueber, F.M., Bothner, W.A., Hatch, N.L., Jr., Finney, S.C., and Aleinikoff, J.N., [abs.]: Geological Society of America Abstracts with Programs, v. 32, no. 1, p. A–67. Thompson 1990, Devonian plants from southern Québec and northern New Hampshire and Thompson 2 Rankin, D.W., and Tucker, R.D., 2009, Bronson Hill and Connecticut Valley 11 Y ch South College Hill Granite Gneiss; crosscuts older and deformed intrusives and paragneiss 1,244 ± 8 Ma Ratcliffe and others (1991); Aleinikoff and others (2011) the age of the Connecticut Valley trough: American Journal of Science, v. 290, no. 44° 30’ sequences in the Stone Mountain area, Northeast Kingdom, Vermont; Trip C–1, in 2 4, p. 360–395, doi:10.2475/ajs.290.4.360. 12 Y gg South Granitic gneiss crosscutting older and deformed intrusives (1.3–1.4-Ga suite) and paragneiss 1,221 ± 4 Ma Ratcliffe and others (1991); Aleinikoff and others (2011) New England Intercollegiate Geological Conference, 101st Annual Meeting, Lyndon LAKE MONTPELIER 3A Karabinos, Paul, and Aleinikoff, J.N., 1990, Evidence for a major Middle Proterozoic State College, Lyndonville, VT, Sept. 25–27, 2009, Guidebook for field trips in the 13 Y mb South Megacrystic granite gneiss at Brandon Gap 1,149 ± 8 Ma Aleinikoff and others (2011) post-Grenvillian igneous event in western New England: American Journal of Northeast Kingdom of Vermont and adjacent regions: Northfield, Vt., Norwich CHAMPLAIN Gale MOUNT 3A Science, v. 290, no. 8, p. 959–974, doi:10.2475/ajs.290.8.959. University, p. C1–1 to C1–12. (Edited by D.S. Westerman and A.S. Lathrop.) SOUTH Hatch 14 Y ma South Megacrystic granite gneiss east of Chittenden Reservoir 1,121 ± 1.4 Ma Karabinos and Aleinikoff (1990) WASHINGTON Karabinos, Paul, Samson, S.D., Hepburn, J.C., and Stoll, H.M., 1998, Taconian Rankin, D.W., Coish, R.A., Tucker, R.D., Peng, Z.X., Wilson, S.A., and Rouff, A.A., Gale Rankin 15 Y3Ama South Megacrystic granite gneiss on the eastern side of the Green Mountain massif 1,119 ± 3.3 Ma Karabinos and Aleinikoff (1990) Rankin orogeny in the New England Appalachians; Collision between Laurentia and the 2007, Silurian extension in the Upper Connecticut Valley, United States and the Mehrtens Stanley Y3Bp South 1,037 ± 6 Ma Aleinikoff and others (2011) Shelburne Falls arc: Geology, v. 26, no. 3, p. 215–218, doi:10.1130/0091–7613 origin of middle Paleozoic basins in the Québec embayment: American Journal of Ratcliffe 16 Migmatite gneiss in the Pine Hill slice (1998)026<0215:TOITNE>2.3.CO;2. Science, v. 307, no. 1, p. 216–264, doi:10.2475/01.2007.07. Stanley Thompson 3C 17 Y cbbh South Bull Hill Gneiss (of Richardson, 1931) in the Chester dome 945 ± 7 Ma Karabinos and Aleinikoff (1990) Kohn, M.J., Orange, D.L., Spear, F.S., Rumble, Douglas, III, and Harrison, T.M., 1992, Ratcliffe, N.M., Aleinikoff, J.N., Burton, W.C., and Karabinos, Paul, 1991, Thompson Walsh 18 Y3Ccbbh South Bull Hill Gneiss (of Richardson, 1931) on the west side of the Athens dome 955 ± 5 Ma Karabinos and Aleinikoff (1990) Pressure, temperature, and structural evolution of west-central New Hampshire; Hot Trondhjemitic, 1.35–1.31 Ga gneisses of the Mount Holly Complex of Vermont; 44° thrusts over cold basement: Journal of Petrology, v. 33, no. 3, p. 521–556. Evidence for an Elzevirian event in the Grenville basement of the United States NEW YORK 3C Appalachians: Canadian Journal of Earth Sciences, v. 28, no. 1, p. 77–93, 19 Y cbsr South Somerset Reservoir Granite 965 ± 4 Ma Karabinos and Aleinikoff (1990) Lyons, J.B., Aleinikoff, J.N., and Zartman, R.E., 1986, Uranium-thorium-lead ages of doi:10.1139/e91-007. 3C the Highlandcroft Plutonic Suite, northern New England: American Journal of 20 Y cbs South Stamford Granite near the Massachusetts border 962 ± 1 Ma Karabinos and Aleinikoff (1990) Science, v. 286, no. 6, p. 489–509, doi:10.2475/ajs.286.6.489. Walsh, G.J., and Aleinikoff, J.N., 1999, U-Pb zircon age of metafelsite from the HAMPSHIRE Pinney Hollow Formation; Implications for the development of the Vermont RUTLAND 21 Zphf South Rhyolitic metafelsite in the Pinney Hollow Formation 571 ± 5 Ma Walsh and Aleinikoff (1999) Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock Appalachians: American Journal of Science, v. 299, no. 2, p. 157–170. TICONDEROGA Rankin Onnt geologic map of New Hampshire: Reston, Va., U.S. Geological Survey, 2 sheets, NEW 22 South Newfane tonalite intruding the Cram Hill Formation near South Newfane 502 ± 4 Ma Aleinikoff and others (2011) scales 1:250,000 and 1:500,000. Ratcliffe Ratcliffe 23 Onb South Trondhjemite in the Barnard Gneiss proper (of Richardson, 1924) north of Proctorsville 496 ± 8 Ma Aleinikoff and others (2011) Walsh 24 Ont South Tonalite gneiss in the North River Igneous Suite near Bartonsville 486 ± 3 Ma Aleinikoff and others (2011) 43° 30’ 25 Ochv South Felsic volcanic layer interlayered with mafic volcanics in the Cram Hill Formation at Springfield 483 ± 3 Ma Aleinikoff and others (2011) 26 Onb South Trondhjemite in the Barnard Gneiss proper (of Richardson, 1924) south of Bethel 471.4 ± 3.7 Ma Karabinos and others (1998) 27 Oj North Joslin Turn pluton 469 ± 1.5 Ma Moench and Aleinikoff (2003) CLAREMONT GLENS FALLS 28 Ohi North Highlandcroft pluton 450 ± 5 Ma Lyons and others (1986) Ratcliffe Ratcliffe 29 Ol North Lost Nation granite 444.1 ± 2.1 Ma Rankin and Tucker (2009) Walsh 30 Ol North Lost Nation granite 442 ± 4 Ma Moench and Aleinikoff (2003) 31 Ol North Lost Nation granite; U-Pb sphene age 443 ± 3 Ma Moench and Aleinikoff (2003) 43° 32 DSwf South Felsic rock in the Waits River Formation 423 ± 4 Ma Aleinikoff and Karabinos (1990); Hueber and others (1990) 33 Scm North Comerford Intrusive Complex at Comerford quarry 419.8 ± 2.6 Ma Rankin and others (2007) ALBANY KEENE 34 Scm North Comerford Intrusive Complex at Leighton Hill 419.3 ± 1.3 Ma Rankin and others (2007) Ratcliffe Ratcliffe 35 Scm North Comerford Intrusive Complex dike at Peaked Mountain 418.5 ± 2 Ma Rankin and others (2007) MASSACHUSETTS 36 Sbd North Diorite in the Braintree Intrusive Complex 419 ± 0.39 Ma Black and others (2004) 0 10 20 30 MILES 37 Onbm South Unmapped felsic dike of Sbg in Onbm near Bridgewater 418 ± 1 Ma Aleinikoff and Karabinos (1990) 38 Sbg North Granite in the Braintree Intrusive Complex 421 ± 7 Ma Aleinikoff and others (2011) 0 10 20 30 40 KILOMETERS 39 Snd North Trondhjemite of the Newport Intrusive Complex 425 ± 3 Ma Aleinikoff and others (2011) 40 Dr North Metarhyolite dike in the Albee Formation 414 ± 4 Ma Lyons and others (1997); Moench and others (1995) 41 Dr North Metarhyolite dike in the Albee Formation 412 ± 2 Ma Lyons and others (1997); Moench and others (1995) INDEX TO COMPILATION RESPONSIBILITY 42 Dfqm North Fairlee Quartz Monzonite 410 ± 5 Ma Moench and Aleinikoff (2003) BY 30 x 60-MINUTE QUADRANGLE (Contributors listed in alphabetical order) 43 Dbgn South Bethlehem Gneiss in the pluton at Bellows Falls 407 ± 5 Ma Kohn and others (1992) 44 Dlr North Metarhyolite in the Littleton Formation 407.5 ± 3.9 Ma Rankin and Tucker (2000) 45 Dgmr North Rhyolite in felsic metavolcanic member of the Gile Mountain Formation 407.0 ± 3.3 Ma Rankin and Tucker (2009) 46 Dg South Granite in the Chester dome 392 ± 6 Ma Aleinikoff and others (2011) 47 Dbbg North Barre Granite 368 ± 4 Ma Aleinikoff and others (2011) 48 Dbmg South Black Mountain pluton 364 ± 4 Ma Aleinikoff and others (2011) 49 Dg South Granite dike south of Plymouth 365 ± 5 Ma Aleinikoff and others (2011) 50 Dfpg North French Pond Granite 365 ± 5 Ma Moench and Aleinikoff (2003) 51 Dgr South Volcanic zircons in quartzite in the Gile Mountain Formation at Royalton 409 ± 5 Ma McWilliams and others (2010)

Suggested citation: Ratcliffe, N.M., Stanley, R.S., Gale, M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. BEDROCK GEOLOGIC MAP OF VERMONT GIS database compiled by Gregory J. Walsh and Marjorie H. Gale By Digital cartography by Linda M. Masonic Edited by James R. Estabrook 1 2* 3 3 1 The Vermont Geological Survey would like to thank former State Geologists Nicholas M. Ratcliffe, Rolfe S. Stanley, Marjorie H. Gale, Peter J. Thompson, and Gregory J. Walsh Charles Ratte´ for initiating State support and Diane Conrad for continued work on this map. With contributions by Norman L. Hatch, Jr.,1* Douglas W. Rankin,1 Barry L. Doolan,2 Jonathan Kim,3 Charlotte J. Mehrtens,2 John N. Aleinikoff,1 and J. Gregory McHone4 1 2 3 4 * This map is available for sale by U.S. Geological Survey, Information U.S. Geological Survey, University of Vermont, Vermont Geological Survey, Wesleyan University, Deceased. Services, Box 25286, Denver Federal Center, Denver, CO 80225 1 For product and ordering information: Cartography by Linda M. Masonic World Wide Web: http://www.usgs.gov; Telephone 1-888-ASK-USGS Any use of trade, product, or firm names in this publication is for descriptive 2011 Printed on recycled paper purposes only and does not imply endorsement by the U.S. Government