Cambrian Hurricane Mountain Formation, metafelsite

Cambrian Hurricane Mountain Formation, metafelsite
State Maine
Name Cambrian Hurricane Mountain Formation, metafelsite
Geologic age Cambrian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > Metarhyolite (Zeolitic (prehnite-pumpellyite))metafelsite; Protolith - rhyolite; 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 T - Rhyolitic volcanic rocks.
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