Middle Devonian Marcellus formation

Marcellus Formation, Middle Devonian, 2 miles northeast of Mt. Union, Mt. Union Quadrangle. 

The Middle Devonian Marcellus Formation consists of black bituminous shale and minor argillaceous limestone lying conformably on the Dundee Formation limestones. Its depositional setting resembles that of the Whitby Formation and the Marcellus... 

The Middle Devonian Marcellus Formation is much thinner and less extensive where it subcrops on the north shore of Lake Erie, although thicknesses of 50 m have been inferred beneath the lake. TOC values up to 11% and Fischer Assay oil yields of 64 1/t have been found. The organic matter is slightly more mature than that in the Kettle Point, and so some bitumen is present. The kerogen is dominantly of marine origin. 

Offshore neritic formations in the Paleozoic rock sequence probably include, on faunal and lithologic grounds, the Lower Ordovician Beekmantown dolomites, Middle Ordovician limestones, and Devonian Marcellus and Burket black shales (Table III). The first two are characterized by 0.1-0.4% organic carbons, very low organic nitrogen, and about 20 p.p.m. hydrocarbons but no carbohydrate residues. The Devonian offshore neritic black shales by contrast... 

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See also in sourсe #XX -- [ ]

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