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Ordovician Bluffer Pond Formation rhyolite member

Ordovician Bluffer Pond Formation rhyolite member
State Maine
Name Ordovician Bluffer Pond Formation rhyolite member
Geologic age Ordovician
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith T - Rhyolitic volcanic rocks
Primary rock type rhyolite
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > RhyoliteW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith T - Rhyolitic volcanic rocks
Map references
Digital bedrock data downloaded from Maine Office of GIS in September 2005 from http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock Bedrock units table (publication date 11/15/2002) downloaded from same site. Permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006.
Unit 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.
Counties Piscataquis