| State | Maine |
|---|---|
| Name | Ordovician granite |
| Geologic age | Ordovician |
| Lithologic constituents | Major
Igneous > Plutonic > Granitic > Granitebiotite granite; U - Unmetamorphosed
|
| Comments | AB - Medium rank amphibolite facies; Protolith W - Mafic to felsic volcanic rocks |
| Stratigraphic units | includes: 39 - Adamstown pluton (ME097, ME098, ME089). |
| 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.Zartman, R.E., Hurley, P.M., Kruger, H.W., and Giletti, B.J., 1970, A Permian disturbance of K-Ar radiometric ages in New England: its occurrence and causes: Geol. Soc. Amer., Bull., v. 81, p. 3359-3374.Aleinikoff, J., 1984, Carboniferous U-Pb age for the Sebago batholith, southwestern Maine: Geol. Soc. Amer., Abs. with Prog., v. 16, p. 1.Lyons, J.B., Zartman, R.E., and Aleinikoff, J.N., 1983, U-Pb ages of zircons from the Ordovician Highlandcroft plutonic suite and Silurian intrusives: Geol. Soc. Amer., Abs. with Prog., v. 15, p. 187. |
| NGMDB product | |
| Counties | Franklin - Oxford - Somerset |