Chipman, Bridport, and Beldens Formations, Providence Island Dolomite; Bridport Dolomite Member (VTOcbr;0)

Chipman, Bridport, and Beldens Formation, Providence Island Dolomite; Bridport Dolomite Member - Buff to brown weathered, sharply defined and laterally persistent beds chiefly of medium bedded to massive, scored dolomite; variously designated Bridport Formation and Providence Island Dolomite in northwestern Vermont.

State	Vermont
Name	Chipman, Bridport, and Beldens Formations, Providence Island Dolomite; Bridport Dolomite Member
Geologic age	Ordovician
Original map label	Ocbr
Comments	Part of Champlain and Vermont Valleys, Beekmantown Group
Primary rock type	dolostone (dolomite)
Secondary rock type
Other rock types
Lithologic constituents	Major Sedimentary > Carbonate > Dolostone (Bed)
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.
Geographic coverage	Addison - Chittenden - Grand Isle - Rutland