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Devonian - Silurian Allagash Lake Formation mixed sedimentary rocks

Devonian - Silurian Allagash Lake Formation mixed sedimentary rocks
State Maine
Name Devonian - Silurian Allagash Lake Formation mixed sedimentary rocks
Geologic age Devonian - Silurian
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone
Primary rock type mudstone
Secondary rock type sandstone
Other rock types limestone; dolostone (dolomite)
Lithologic constituents
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.
Forbes, W.H., pers. communication, in Pollock, 1983.
Counties Piscataquis