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Merrimack Group, Berwick Formation

Merrimack Group, Berwick Formation - Purple biotite-quartz-feldspar granofels or schist and interbeds of calc-silicate granofels and minor metapelites. Stratigraphic sequence with respect to Eliot Formation uncertain
StateNew Hampshire
NameMerrimack Group, Berwick Formation
Geologic ageOrdovician? - Silurian?
Original map labelSOb
CommentsPart of the Nashoba-Casco-Miramichi Terrane (Merrimack Trough). Biotite granite dike (point within formation) = 381+/-2 U/Pb per NH002 (map page 2).
Primary rock typegranofels
Secondary rock typequartz-feldspar schist
Other rock typesmeta-argillite
Lithologic constituents
Major
Metamorphic > Schistbiotite-quartz-feldspar schist, minor metapelites
Metamorphic > Granoblastic > Granofelspurple biotite-quartz-feldspar granofels, interbeds of calc-silicate granofels
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rock
Map references
Bennett, D. S, , Wittkop, C.A., and Dicken, C.L., 2006 , Bedrock Geologic Map of New Hampshire - A Digital Representation of the Lyons and others 1997 map and ancillary files: U.S. Geological Survey Data Series 215, scale 1:250,000, CD-ROM.
Unit 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, 1:250,000, 2 sheets.
Geographic coverageHillsborough - Merrimack - Rockingham - Strafford

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