| State | Maine |
|---|---|
| Name | Penobscot Formation, Basalt Member |
| Geologic age | Ordovician - Cambrian |
| Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > BasaltAA - Low rank amphibolite facies; Protolith V - Basaltic volcanic rocks
|
| Comments | U - Unmetamorphosed; GS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks |
| 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.Boucot, A.J., Brookins, D.G., Forbes, W.H., and Guidotti, C.V., 1972, Staurolite zone, Caradoc (Middle-Late Ordovician) age, Old World province brachiopods from Penobscot Bay, Maine: Geol. Soc. Amer., Bull., v. 83, p. 1953-1960. |
| NGMDB product | |
| Counties | Knox - Waldo |