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Cumberland Head Formation

Cumberland Head Formation - Interbedded calcareous black shale and fine-grained homogenous, dark-gray limestone; shown only in Grand Isle County where it is thick enough and well enough exposed to map.
State Vermont
Name Cumberland Head Formation
Geologic age Ordovician
Comments Part of Champlain and Vermont Valleys, Trenton Group
Primary rock type black shale
Secondary rock type limestone
Other rock types
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale (Calcareous)interbedded calcareous black shale
Sedimentary > Carbonate > Limestone (Bed)fine-grained homogenous, dark-gray limestone
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.
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.
Counties Grand Isle