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Ironbound Mountain Formation, undivided

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Interbedded gray phyllite, in places containing feldspathic clasts, and feldspathic metasandstone, variably graded.
State New Hampshire
Name Ironbound Mountain Formation, undivided
Geologic age Lower Devonian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Metasedimentary > Metaclastic > Metasandstonein places containing feldspathic clasts, and feldspathic metasandstone
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