Ordovician - Cambrian Chase Brook Formation

Ordovician - Cambrian Chase Brook Formation
State Maine
Name Ordovician - Cambrian Chase Brook Formation
Geologic age Ordovician - Cambrian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Slate (Greenschist, Zeolitic (prehnite-pumpellyite))W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Z - Melange
Minor
Sedimentary > Carbonate > LimestoneW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Z - Melange
Sedimentary > Clastic > SiltstoneW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Z - Melange
Comments AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; Protolith I - Conglomerate
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.

Hall, B.A., 1970, Stratigraphy of the southern end of the Munsungun anticlinorium, Maine: Maine Geol. Surv., Bull. 22, 63 p.

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

NGMDB product
Counties Aroostook - Piscataquis