Silurian West Branch Volcanic Rocks

Silurian West Branch Volcanic Rocks
State Maine
Name Silurian West Branch Volcanic Rocks
Geologic age Silurian
Lithologic constituents
Major
Igneous > VolcanicW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith W - Mafic to felsic volcanic rocks
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist 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.

Hanson, L.S., Bradley, D.C. and Caldwell, D.W., 1993, Geology and geomorphology of the Acadian Orogen, central Maine, IN Cheney, J.T., and Hepburn, J.C., eds., Field trip guidebook for the northeastern United States; 1993 Boston GSA; Volume 2: University of Massachusetts, Geology Department Contribution, no. 67, Joint annual meeting of Geological Society of America, and New England Intercollegiate Geological Conference, 85th, Boston, MA, October 25-28, 1993, p. CC1-CC27.

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

NGMDB product
Counties Piscataquis