Washburn Brook Formation - metamorphosed sedimentary breccia (VTOws;0)

Washburn Brook Formation - metamorphosed sedimentary breccia

Metamorphosed sedimentary breccia interlayered with dark-gray slate and micaceous siltstone. Clasts include light-colored, fine-grained metasandstone and metasiltstone of the Albee Formation, dark-gray or greenish-gray slate, and coticule-bearing metasiltstone and chert as well as sparse quartz pebbles. Matrix consists of fine-grained metasandstone, metasiltstone, or dark-gray or greenish-gray slate. Stratified rocks of the Bronson Hill arch and Sawyer Mountain belt.

State	Vermont
Name	Washburn Brook Formation - metamorphosed sedimentary breccia
Geologic age	Upper and Middle Ordovician
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > MetaconglomerateMetamorphosed sedimentary breccia; Clasts include light-colored, fine-grained metasandstone and metasiltstone of the Albee Formation, dark-gray or greenish-gray slate, and coticule-bearing metasiltstone and chert as well as sparse quartz pebbles. Matrix consists of fine-grained metasandstone, metasiltstone, or dark-gray or greenish-gray slate. Sedimentary > Clastic > Siltstone (Bed)Interlayered with micaceous siltstone. Metamorphic > Metasedimentary > Metaclastic > SlateInterlayered with dark-gray slate.
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	Essex

Washburn Brook Formation - metamorphosed sedimentary breccia

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.