Ordovician - Cambrian Megunticook Formation

Ordovician - Cambrian Megunticook Formation
State Maine
Name Ordovician - Cambrian Megunticook Formation
Geologic age Ordovician - Cambrian
Lithologic constituents
Major
Metamorphic > Schist (Amphibolite, Greenschist)Protolith A - Pelite; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies.
Metamorphic > Granulite (Amphibolite, Greenschist)Protolith A - Pelite; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies.
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Amphibolite, Greenschist)Protolith A - Pelite; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies.
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Z - Melange
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 Knox - Waldo