Abstract

Elevated vitrinite reflectance values have been observed in the Upper Devonian West Falls Group of the northern New York Appalachian Basin in New York. Lopatin modeling suggests that the high thermal maturity of these and associated strata was caused by the presence of a Devonian and Carboniferous overburden that has subsequently been eroded from the northern Appalachian Basin. Devonian overburden, reconstructed from extrapolation of stratigraphic data, thickens from west (0.4 km) to east (2.0 km) across the field area. In contrast Carboniferous overburden, reconstructed by Lopatin modeling, thins from west (2.0–3.4 km) to east (0.7–1.2 km). The inferred geometry of a northeasterly-thinning wedge of sediment is compatible with the existing distribution of late Paleozoic sediments in the Appalachian Basin and suggests the northern part of the basin experienced only moderate subsidence during Carboniferous time.

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