|Name||Devonian Beck Pond Limestone|
Sedimentary > Carbonate > LimestoneGS - Greenschist facies; Protolith S - interbedded pelite, sandstone, and limestone and/or dolostone
Sedimentary > Carbonate > DolostoneGS - Greenschist facies; Protolith S - interbedded pelite, sandstone, and limestone and/or dolostone
Sedimentary > Clastic > SandstoneGS - Greenschist facies; Protolith S - interbedded pelite, sandstone, and limestone and/or dolostone
Sedimentary > Clastic > MudstoneGS - Greenschist facies; Protolith S - interbedded pelite, sandstone, and limestone and/or dolostone
|Comments||Named for exposures near Gonic, Strafford Co., southeastern NH. Consists of whitish or light-gray to dark-gray, thin-bedded, fine-grained arenaceous (graywacke) and argillaceous materials metamorphosed to schist and phyllite. Includes mica schist and phyllite and interbedded fine- to medium-grained micaceous graywacke schists in beds up to 2 ft thick; light- and dark-gray, fine-grained phyllites abundantly studded with dark staurolite crystals; and minor coarse muscovite schist composed almost wholly of mica and very thin quartz laminae. Argillaceous materials predominate, but graywacke is also prominent. Thickness is unknown. Probably underlies Rindgemere formation. (ME036) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith A - Pelite.|
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., 1961, Stratigraphy of the Moose River synclinorium, IN Contributions to general geology, 1959: U.S. Geological Survey Bulletin, 1111-E, p. E153-E188.
Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, A.M., III, Marvinney, R.G. and Aleinikoff, J.N., 1995, Geologic map of the Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, and Quebec, Canada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1898-D, 56 p., 2 sheets, scale 1:250,000, Prepared in cooperation with the Maine Geological Survey and the New Hampshire Geological Survey.
Boucot, A.J., 1969, Geology of the Moose River and Roach River synclinoria, northwestern Maine: Maine Geol. Surv., Bull. 21, 123 p.