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Frontenac Formation, undivided

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Interbedded thick feldspathic wackes, tan and green slates, and minor calcareous lenses.
State New Hampshire
Name Frontenac Formation, undivided
Geologic age Silurian?
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywackeinterbedded thick feldspathic wackes
Metamorphic > Metasedimentary > Metaclastic > Slate
Comments Part of the Grenville Terrane (Connecticut Valley Trough).
References

Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock Geologic Map of New Hampshire: Reston, VA, U.S. Geological Survey Special Map, 2 sheets, scale 1:250,000.

https://ngmdb.usgs.gov/Prodesc/proddesc_37338.htm
NGMDB product
Counties Coos