Chipman Formation - Bascom Formation (VTOb;0)

Chipman Formation - Bascom Formation

Interbedded orangey-tan- to buff-weathering dolostone and bluish-gray to gray mottled dolomitic limestone or calcite marble and calcareous sandstone. In southern Vermont east of the Taconic Range, rocks mapped as Bascom Formation may include unmapped members of the Chipman Formation. Vermont Valley sequence and Middlebury synclinorium (above the Orwell and Champlain thrusts).

State	Vermont
Name	Chipman Formation - Bascom Formation
Geologic age	Middle and Lower Ordovician
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed, Calcareous) Metamorphic > Metasedimentary > Metacarbonate > MarbleCalcite marble. Sedimentary > Carbonate (Bed)Interbedded orangey-tan- to buff-weathering dolostone and bluish-gray to gray mottled dolomitic limestone.
References	Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. https://pubs.er.usgs.gov/publication/sim3184
NGMDB product	NGMDB product page for 96860
Counties	Addison - Bennington - Chittenden - Franklin - Grand Isle - Rutland

Chipman Formation - Bascom Formation

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.