Ordovician Quimby Formation, graywacke member

Ordovician Quimby formation graywacke member
State Maine
Name Ordovician Quimby Formation, graywacke member
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > GraywackeGS - Greenschist facies; Protolith D - Lithic sandstone
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith U - Andesitic volcanic rocks
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.

NGMDB product
Counties Franklin - Somerset