Ironbound Mountain Formation, Grits at Halls Stream in northern New Hampshire

Thickly bedded feldspathic volcaniclastic grit and interbedded gray slate. Equivalent to Grenier Ponds Member of the Ironbound Mountain Formation in western Maine.
State New Hampshire
Name Ironbound Mountain Formation, Grits at Halls Stream in northern New Hampshire
Geologic age Lower Devonian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanicthickly bedded feldspathic volcaniclastic grit
Metamorphic > Metasedimentary > Metaclastic > Slate
Comments Part of the Grenville Terrane (Connecticut Valley Trough).
References
NGMDB product
Counties Coos