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Granite, granodiorite, and trondhjemite

Granite, granodiorite, and trondhjemite.
StateNew Hampshire
NameGranite, granodiorite, and trondhjemite
Geologic ageLate Ordovician
Original map labelOo1-3B
CommentsPart of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies.
Primary rock typegranite
Secondary rock typegranodiorite
Other rock typestrondhjemite
Lithologic constituents
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 coverageCheshire - Sullivan

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