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Stony Point Formation

Stony Point Formation - Predominantly calcareous black shale that grades upward into argillaceous limestone and rare dolomite beds, in northwestern Vermont.
State Vermont
Name Stony Point 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 dolostone (dolomite)
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Calcareous)predominantly calcareous black shale
Minor
Sedimentary > Carbonate > Limestone (Bed)argillaceous limestone
Incidental
Sedimentary > Carbonate > Dolostone (Bed)rare dolomite beds
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 Addison - Chittenden - Grand Isle