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Underhill Formation

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Silvery-green quartz-muscovite-chlorite schist and phyllite, commonly with albite and magnetite; locally contains dolomite. Cover rocks north of the Lincoln Mountain massif.
State Vermont
Name Underhill Formation
Geologic age Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist > Muscovite-schistSilvery-green quartz-muscovite-chlorite schist and phyllite, commonly with albite and magnetite.
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Minor
Sedimentary > Carbonate > Dolostone
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 Addison - Chittenden - Franklin - Lamoille - Washington