|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)|
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.
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.