Perry Mountain Formation, undivided (NHSp;0)

State	New Hampshire
Name	Perry Mountain Formation, undivided
Geologic age	Lower? - Middle? Silurian
Original map label	Sp
Comments	Part of the Central Maine Composite Terrane (Central Maine Trough) - Variably metamorphosed sedimentary and volcanic rocks of greenschist to granulite facies, locally migmatized. Area includes structural belts between the Monroe fault on the west and the Campbell Hill fault on the east; that is, the Bronson Hill anticlinorium, Piedmont allochthon, Kearsarge-central Maine synclinorium, central New Hampshire anticlinorium, and Rochester-Lebanon (Maine) antiformal synclinorium.
Primary rock type	quartzite
Secondary rock type	meta-argillite
Other rock types	metasedimentary rock
Lithologic constituents	Major Metamorphic > Metasedimentarynongraphitic metapelite, and "fast-graded" meta-turbidites Metamorphic > Metasedimentary > Metaclastic > Quartzitesharply interbedded quartzites
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. [http://pubs.er.usgs.gov/publication/ds215]
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 coverage	Belknap - Carroll - Cheshire - Coos - Grafton - Hillsborough - Merrimack - Rockingham - Strafford