Upper part of Rangeley Formation (NHSru;0)

State	New Hampshire
Name	Upper part of Rangeley Formation
Geologic age	Lower Silurian (Llandoverian)
Original map label	Sru
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. Granite sill, Gilmanton quadrangle (point within formation): 372+/-? U/Pb, monazite per NH030. Granite pegmatite, Suncook quadrangle (point within formation) 375+/-? U/Pb per NH030.
Primary rock type	pelitic schist
Secondary rock type	metasedimentary rock
Other rock types	calc-silicate rock
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Metasandstonemetasandstone, and local coarse-grained metasandstone lentils Metamorphic > Schistpelitic schist Minor Metamorphic > Metasedimentary > Calc-silicate-rockcalc-silicate pods common; minor coticule
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. Eusden, J.D., Jr., and Barreiro, Barbara, 1988, The timing of peak high-grade metamorphism in central-eastern New England: Maritime Sediments and Atlantic Geology, v. 24, p. 241-255.
Geographic coverage	Belknap - Carroll - Cheshire - Grafton - Hillsborough - Merrimack - Strafford - Sullivan