|Name||Devonian Hobbstown Formation|
Sedimentary > Clastic > ConglomerateGS - Greenschist facies; Protolith H - Lithic sandstone and conglomerate
Sedimentary > Clastic > Sandstone > ArkoseGS - Greenschist facies; Protolith H - Lithic sandstone and conglomerate
|Comments||Usage follows that of Pollock (1987) who assigns it to the Seboomook Group. Occurs in central Maine trough. Consists of thinly bedded calc-silicate rocks, white marble, volcaniclastic graywacke, and black, sulfidic schist. Includes separately mapped euxinic black shale member. Remnants of Hildreths occur in migmatitic gneiss of overlying Mount Blue Formation of Seboomook Group. Age is Early Devonian. (ME011) Unit description from USGS GEOLEX website (ME078). AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone.|
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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.
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US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.