Allegheny series (Lower Coal Measures) developed in valley of Allegheny River. Underlies Monongahela series, the body between the two series being marked by final outcrop of these shales exposed just above Ohio River at Pittsburg, and overlies formation XII (coarse, massive white sandstone, about 100 feet thick), which constitutes bottom of productive coal measures, and which appears to include at base the sandstone on Tionesta Creek [Homewood sandstone member of Pottsville formation]. [The above definition includes Allegheny and Conemaugh formations of later usage.]

Source: GNU records (USGS DDS-6; Reston GNULEX).

Allegheny group described in Brookville quadrangle. Includes all rock between top of Upper Freeport coal and base of clay under Brookville coal. Contains seven coal beds or horizons (descending): Upper Freeport, Lower Freeport, Upper Kittanning, Middle Kittanning, Lower Kittanning, Clarion, and Brookville. Divided into three formations: Freeport, extending from top of Upper Freeport coal to top of Upper Kittanning coal; Kittanning, extending from top of Upper Kittanning coal to base of clay under Lower Kittanning coal; Clarion, extending from base of Kittanning formation to bottom of clay under Brookville coal. Thickness about 325 ft. Underlies Conemaugh group; overlies Pottsville series.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Western facies of formal Vanport Limestone Member of Allegheny Formation in central OH is cherty. In northern OH, it is discontinuous and covered by glacial deposits in some of the area between Flint Ridge and Lowellville. On the basis of stratigraphic position, Vanport Limestone Member in central OH (Zaleski and Flint Ridge areas) is correlated with Zaleski Flint Member of Wanless (1939, 1975) of Allegheny Formation in southern OH (Shawnee and Flint Ridge areas). Vanport appears to merge with Putnam Hill Limestone Member of Allegheny Formation in northeastern OH and western PA. In southern OH, a similar merger with overlying Zaleski Flint Member. Thus, Vanport in most of PA is probably a single, uninterrupted marine-bay deposit while an earlier transgression (represented by Putnam Hill Limestone Member in OH, Kilgore Flint Member of Breathitt Formation in KY, Limekiln limestone of Johnston (1962) and Flint Ridge flint of Morse (1931) of Breathitt Formation, and Kanawha black flint of Wanless (1939, 1975) of Kanawha Formation in WV) resulted in deposits extending far south into KY and WV. A later, more limited transgression is represented by Vanport Limestone Member and its southernmost extension, Zaleski Flint Member. Correlatives of Vanport and Zaleski do not occur in eastern KY or WV because of nondeposition. Preliminary analyses of conodonts in Putnam Hill and Vanport Limestone Members in OH indicate that they have similar fauna and may represent parts of the same unit. Presence of fusulinid BEEDEINA LEEI (Skinner) in Putnam Hill in OH and in Vanport of PA indicates close temporal association. B. CARMANI (Thompson) was collected from both Vanport and Putnam Hill in OH. Allegheny Formation in southern OH revised to include Obryan Member, a newly named member of Breathitt Formation in northeastern KY. Obryan was previously identified as informal Vanport or "Ferriferous" limestone member of Allegheny Formation by Stout (1916). Obryan correlates with Columbiana Member (previously misidentified as "Hamden" limestone by Stout, 1916) of Allegheny Formation in central OH; both Obryan and Columbiana contain conodonts including new species HINDEODUS as well as a species of NEOGNATHODUS that differs from that of underlying Vanport Limestone Member.

Source: GNU records (USGS DDS-6; Reston GNULEX).