Ottauquechee Formation, Greenstone and Amphibolite (VTCAog;0)

Ottauquechee Formation, Greenstone and Amphibolite. The Ottauquechee contains two major units: A black phyllite and the Thatcher Brook Member. The black phyllite contains a previously unreported sub-unit of gray carbonate schist. The Thatcher Brook Member (named in an abstract by Armstrong and others, 1988) is a carbonaceous albitic schist with greenstones and ultramafics. These rocks have previously been included in the Ottauquechee but have never been differentiated from the black phyllite. Member is in fault contact with the silvery green schist of the Pinney Hollow Formation to the west. Age is Cambrian (Ratcliff, in press).

State	Vermont
Name	Ottauquechee Formation, Greenstone and Amphibolite
Geologic age	Cambrian
Original map label	Cog
Comments	Part of Green Mountains Secondary unit description per VT016.
Primary rock type	greenstone
Secondary rock type	amphibolite
Other rock types
Lithologic constituents	Major Metamorphic > Amphibolite Metamorphic > Metaigneous > Greenstone
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. Ratcliffe, N.M., in press, Bedrock geologic map of the Jamaica quadrangle and portions of the Townshend quadrangle, Windham County, Vermont: U.S. Geological Survey Miscellaneous Investigations Series Map, I-__, 1 sheet, scale 1:24,000. [http://pubs.er.usgs.gov/publication/i2453]
Geographic coverage	Washington - Windsor