Clarendon Springs, Ticonderoga, and Rock River Dolomites; Gorge Formation (VTCAcs;0)

Clarendon Springs, Ticonderoga, and Rock River Dolomite; Gorge Formation - Fairly uniform, massive, smooth weathered gray dolomite characterized by numerous geodes and knots of white quartz; quartz sandstone and irregular masses of chert are near the top. Called the Ticonderoga west of Orwell and Champlain thrusts and the Rock River east of Philipsburg thrust. The Gorge is a partly conglomeratic facies on the west limb of the St. Albans synclinorium..

State	Vermont
Name	Clarendon Springs, Ticonderoga, and Rock River Dolomites; Gorge Formation
Geologic age	Cambrian
Original map label	Ccs
Comments	Part of Champlain and Vermont Valleys Conodont biostratigraphy indicates that the Gorge Formation in VT is of Late Cambrian and Early Ordovician age (Landing, 1983) per VT015.
Primary rock type	dolostone (dolomite)
Secondary rock type	sandstone
Other rock types	chert; conglomerate
Lithologic constituents	Major Sedimentary > Carbonate > Dolostonemassive, smooth weathered gray dolomite characterized by numerous geodes and knots of white quartz Incidental Sedimentary > Clastic > ConglomerateThe Gorge is a partly conglomeratic facies on the west limb of the St. Albans synclinorium. Sedimentary > Chemical > Chertirregular masses of chert are near the top Sedimentary > Clastic > Sandstone
Map references	Nicholson, S.W., Dicken, C.L., Horton, J.D., Foose, M.P., Mueller, J.A.L., and Hon, Rudi, 2006, Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont: U.S. Geological Survey Open-File Report 2006-1272. [http://pubs.er.usgs.gov/publication/ofr20061272]
Unit references	Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial Geologic Map of Vermont: Vermont Geological Survey, Miscellaneous Map MISCMAP-01, scale 1:250,000. Landing, Ed, 1983, Highgate Gorge; Upper Cambrian and Lower Ordovician continental slope deposition and biostratigraphy, northwestern Vermont: Journal of Paleontology, v. 57, no. 6, p. 1149-1187.
Geographic coverage	Addison - Bennington - Chittenden - Franklin - Rutland