Frontenac Formation (VTDSfr;0)

Frontenac Formation

Thick-bedded, ankeritic, micaceous, and feldspathic metasandstones interlayered with subordinate dark-gray metapelite. Metasandstone beds commonly are rusty weathering and up to 4 m thick; calc-silicate lenses locally present. Part of the Connecticut Valley Trough.

State	Vermont
Name	Frontenac Formation
Geologic age	Devonian and Silurian
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > MetasandstoneThick-bedded, ankeritic, micaceous, and feldspathic metasandstones. Metasandstone beds commonly are rusty weathering and up to 4 m thick. Minor Metamorphic > Metasedimentary > MetaclasticInterlayered with subordinate dark-gray metapelite. Incidental Metamorphic > Metasedimentary > Calc-silicate-rockCalc-silicate lenses locally present.
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

Frontenac 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.