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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.
||Ironbound Mountain Formation, Grits at Halls Stream in northern New Hampshire
Metamorphic > Metaigneous > Metavolcanicthickly bedded feldspathic volcaniclastic grit
Metamorphic > Metasedimentary > Metaclastic > Slate
||Part of the Grenville Terrane (Connecticut Valley Trough).
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.