|Name||Devonian unnamed limestone conglomerate|
Sedimentary > Clastic > ConglomerateGS - Greenschist facies; Protolith N - limestone and/or dolostone
|Comments||Probably named for Trout Brook valley. Crops out over an area about 1.5 by 8 mi. Consists of predominantly clastic rocks, mainly a heterogeneous assemblage of light-bluish-gray to black shale, siltstone, sandstone, and conglomerate; includes small amount of black sideritic ironstone and sandstone. Maximum exposed thickness of 1000 ft. To the north and west, abuts high-angle normal fault and is on downthrown side of fault. To the south and east, unconformably overlies series of felsite lavas, tuffs, and welded tuff called Traveller rhyolite by Toppan (1932). Plant fossils described. (ME019) Unit description from USGS GEOLEX website (ME078). U- unmetamorphosed; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith H - Lithic sandstone and conglomerate.|
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.
|Counties||Aroostook - Washington|