Silurian greenstone rocks of the Fivemile Brook sequence

Silurian greenstone rocks of the Fivemile Brook sequence
State Maine
Name Silurian greenstone rocks of the Fivemile Brook sequence
Geologic age Silurian
Lithologic constituents
Major
Metamorphic > Metaigneous > Greenstone (Zeolitic (prehnite-pumpellyite))W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith V - Basaltic volcanic rocks
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist 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.

Roy, D.C., 1980, Evaluation of the mineral potential, upper St. John River Valley, Aroostook County, Maine; Appendix A; Bedrock geology of pre-Devonian rocks in northwestern-most Aroostook County, Maine: Maine Geological Survey Open-File. Report, no. 80-14b, 34 p., 3 sheets, (incl. geologic map, scale 1:62,500).

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

NGMDB product
Counties Aroostook