| State | Maine |
|---|---|
| Name | Devonian - Silurian Allagash Lake Formation, basalt and mixed sedimentary rocks |
| Geologic age | Devonian - Silurian |
| Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > BasaltProtolith V - Basaltic volcanic rocks; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
|
| Comments | W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith S - Interbedded pelite, sandstone, and 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.Forbes, W.H., pers. communication, in Pollock, 1983. |
| NGMDB product | |
| Counties | Piscataquis |