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Washburn Brook Formation - siltstone, quartzite, volcanogenic chert, and ironstone

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Metamorphosed gray siltstone, quartzite, volcanogenic chert, and ironstone, all typically containing coticule and magnetite. Stratified rocks of the Bronson Hill arch and Sawyer Mountain belt.
State Vermont
Name Washburn Brook Formation - siltstone, quartzite, volcanogenic chert, and ironstone
Geologic age Upper and Middle Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneMetamorphosed gray siltstone, quartzite, volcanogenic chert, and ironstone, all typically containing coticule and magnetite.
Metamorphic > Metasedimentary > Metaclastic > QuartziteMetamorphosed gray siltstone, quartzite, volcanogenic chert, and ironstone, all typically containing coticule and magnetite.
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
Counties Essex