Named Huron shale for the Huron River in OH. Consists of black bituminous shale, 350 feet thick, designated by former Geological Board as "Black Slate." Overlies Hamilton limestone and underlies Devonian bluish or greenish Erie shale. Extends from lake shore at mouth of Huron River south to mouth of Scioto. Unit is of Late Devonian age.

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

Huron Member of the Ohio Shale extended from OH and eastern KY into western PA, western WV, western VA, and northeastern TN. Reduced in rank to Huron Bed of Gassaway Member of Chattanooga Shale in south-central KY, central TN, northeastern AL, and northwestern GA.

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

Authors follow de Witt (1981) in restricting the New Albany Shale to the Illinois basin and the Ohio Shale to the Appalachian basin. Ohio Shale terminology used wherever Three Lick Bed is recognizable in cores. Unlike de Witt (1981), authors do not use Chattanooga Shale in Knobs outcrop area of south-central KY. Most of New Albany correlates with the Huron Member of Ohio Shale. Upper 1 to 2 m correlates with Cleveland Member. Dolomitic interval at the base of the Huron herein referred to the "Duffin lithology," usage modified from Campbell (1946). Duffin lithology occurs in southern and east-central portions of outcrop belt. Late Devonian Ohio Shale is subdivided into (ascending) Huron Member, Three Lick Bed, and Cleveland Member.

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

In northern OH, Ohio Shale includes two sequences of black shale, the Huron Member below and the Cleveland Member above. A tongue of Chagrin Shale separates the Huron from the Cleveland in northern and eastern OH. In outcrops in central and southern OH and much of northeastern and central KY, the Three Lick Bed of the Ohio Shale, (a featheredge of the Chagrin Shale) separates the two members. In southern KY and central TN, the Huron and Cleveland are present as beds in the Gassaway Member of the Chattanooga Shale. The Huron is thicker and more extensive than the Cleveland. In northwestern PA and adjacent western NY, the Huron becomes the Dunkirk Shale Member of the Perrysburg.

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

Cross section between Norton and Asberrys, VA, in the Clinch Mountain outcrop belt shows more detailed divisions of Chattanooga Shale than previously indicated. Base of Chattanooga marked by Belpre Ash. Ascending, members are Rhinestreet Shale, Angola Shale, Java Shale (which contains the Center Hill Ash), Dunkirk Shale Tongue of Huron Shale Member and remaining upper part of Huron, Three Lick Bed, Cleveland Shale Member, and Sunbury Shale Member. According to authors, divisions are based on careful outcrop description and outcrop gamma-ray log. Divisions can be traced by borehole gamma-ray logs to their type areas in OH and NY.

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