Cambrian Hurricane Mountain Formation, black and gray metaquartzite

Cambrian Hurricane Mountain Formation, black and gray metaquartzite
State Maine
Name Cambrian Hurricane Mountain Formation, black and gray metaquartzite
Geologic age Cambrian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Zeolitic (prehnite-pumpellyite))Protolith E- feldspathic sandstone; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite;
Comments Consists of dark, rusty-weathering, siliceous, scaly slate or schist, with flaser structure and polymict fragments ranging in size from a few millimeters up to (in ME) several hundred meters. Considered a melange consisting of metasedimentary, felsic and mafic metavolcanic, and ultramafic rocks. Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith E - Feldspathic sandstone.
References

Osberg, P.H., Hussey, A.M., and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.

US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.

NGMDB product
Counties Somerset