Ordovician - Cambrian Dead River Formation, lower member

Ordovician - Cambrian Dead River formation lower member
State Maine
Name Ordovician - Cambrian Dead River Formation, lower member
Geologic age Ordovician - Cambrian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Amphibolite epidote-amphibolite, Greenschist, Zeolitic (prehnite-pumpellyite))Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite.
Minor
Metamorphic > Metasedimentary > Metaclastic > Phyllite (Amphibolite epidote-amphibolite, Greenschist, Zeolitic (prehnite-pumpellyite))Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite.
Comments GS - Greenschist facies; Protolith W - Mafic to felsic 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 Franklin - Oxford - Piscataquis - Somerset