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Underhill Formation - quartzite, granofels, and metawacke

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Local lenses of white to pale-gray quartzite, quartz-albite granofels, quartz-granule chlorite (±biotite) metawacke. Cover rocks north of the Lincoln Mountain massif.
State Vermont
Name Underhill Formation - quartzite, granofels, and metawacke
Geologic age Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Granoblastic > GranofelsWhite to pale-gray quartz-albite granofels.
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > MetagraywackeWhite to pale-gray quartz-granule chlorite (±biotite) metawacke.
Metamorphic > Metasedimentary > Metaclastic > QuartziteWhite to pale-gray quartzite.
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 - Franklin - Lamoille