Ordovician - Cambrian Aziscohos Formation

Ordovician - Cambrian Aziscohos Formation
State Maine
Name Ordovician - Cambrian Aziscohos Formation
Geologic age Ordovician - Cambrian
Lithologic constituents
Major
Sedimentary > Clastic > SiltstoneProtolith A - Pelite; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies.
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Amphibolite)Protolith A - Pelite; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies.
Sedimentary > Clastic > Mudstone > ShaleProtolith A - Pelite; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies.
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; Protolith Q - Interbedded pelite and 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.

Moench, R.H. and Pankiwskyj, K.A., 1988, Geologic map of western interior Maine: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1692, 21 p., 1 sheet, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i1692

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

NGMDB product
Counties Oxford