Silurian - Precambrian Z Berwick Formation

Silurian - Precambrian Z Berwick Formation
State Maine
Name Silurian - Precambrian Z Berwick Formation
Geologic age Silurian - Precambrian Z
Lithologic constituents
Major
Metamorphic > Gneiss (Greenschist, Amphibolite epidote-amphibolite)GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith K - Calcareous feldspathic sandstone
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Greenschist, Amphibolite epidote-amphibolite)GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith K - Calcareous feldspathic sandstone
Metamorphic > Metasedimentary > Metaclastic > Slate (Greenschist, Amphibolite epidote-amphibolite)GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith K - Calcareous feldspathic sandstone
Metamorphic > Schist (Greenschist, Amphibolite epidote-amphibolite)GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith K - Calcareous feldspathic sandstone
Comments AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; Protolith C - Sulfidic/carbonaceous pelite
Stratigraphic units Merrimack Group
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.

Katz, F.J., 1917, Stratigraphy in southwestern Maine and southeastern New Hampshire, IN Shorter contributions to general geology, 1917: U.S. Geological Survey Professional Paper, 108-I, p. 165-177.

https://pubs.er.usgs.gov/publication/pp108I

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

NGMDB product
Counties York