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Danby and Potsdam Formations

Danby and Potsdam Formations - The Danby is comprised of interbedded quartzite and dolomite; white quartzite beds, more than a foot thick, separated by 10 to 12 feet of dolomite in eastern areas, increase westward to continuous sections of white to pink weathered, massively bedded Potsdam quartzite, west of Orwell thrust.
State Vermont
Name Danby and Potsdam Formations
Geologic age Cambrian
Comments Part of Champlain and Vermont Valleys
Primary rock type quartzite
Secondary rock type dolostone (dolomite)
Other rock types
Lithologic constituents
Sedimentary > Carbonate > Dolostone (Bed)
Metamorphic > Metasedimentary > Metaclastic > Quartzite
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 - Bennington - Chittenden - Rutland