Precambrian Z Rye Formation

Precambrian Z Rye Formation
State Maine
Name Precambrian Z Rye Formation
Geologic age Precambrian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic (Greenschist)GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Metamorphic > Metasedimentary (Greenschist)GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Incidental
Metamorphic > Metasedimentary > Metacarbonate > Marble (Greenschist)GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Metamorphic > Amphibolite (Greenschist)GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Metamorphic > Metasedimentary > Metaclastic > Phyllite (Greenschist)GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Comments Waterville includes unnamed limestone member that ranges from highly metamorphosed coarsely crystallized calc-silicate rock to less metamorphosed micritic metalimestone, calcareous metasiltstone, and pelitic slate or schist, previously mapped as Berry Ledge Formation in Bryant Pond 15-min quad by Guidotti (1963). Also includes black shale lenses consisting of thin lenticular bodies of rusty-weathering, black sulfidic slate or phyllite. (ME004) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith N - Limestone and/or dolostone
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 York