Pg. 34, 35, 36, 48 (table 1), 65, pl. 1. Herrin coal member of Carbondale formation of Kewanee group (new). Assigned member status in Carbondale formation in Illinois. In southern area, occurs above Vermilionville sandstone member and below Brereton limestone member; in northern and western area, occurs above Big Creek shale member and below Brereton limestone member; in eastern area, occurs above Harrisburg (No. 5) coal member and below Danville (No. 7) coal member. Thickness about 5 feet. Name Brereton is extended to caprock of No. 6 coal to replace name Herrin, now restricted to the coal. Coal named by Worthen (1870, IN Geol. And Paleo., v. 4, Illinois Geol. Survey). Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian in Illinois.
Type locality: in mines in vicinity of Herrin, Williamson Co., IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1745).

Pg. 72 (article by C.E. Wier). Herrin Coal Member of Dugger Formation of Carbondale Group. Name credited to C.E. Wier (in prep.). Bright-banded coal with clay or shale partings. Occurs as streaks of coal and thin smut streaks below Providence Limestone Member in Warrick County; thickens westward in Vanderburgh and Posey Counties, where it ranges from 2 to 5 feet. Known as No. 11 coal in Henderson County, Kentucky. Age is Pennsylvanian.
Name credited to Worthen (1870, p. 93) and Shaw and Savage (1912, p. 6). Named from Herrin, Williamson Co., IL, where the coal was extensively mined.
Wier (in prep.) [= Stratigraphy of the Carbondale and McLeansboro Groups in southwestern Indiana, Indiana Geol. Survey Bull. XX, 171 p., unpub. ms., ca. 1961; available online through Indiana Univ. Scholarworks http://hdl.handle.net/2022/3612, accessed September 18, 2009]

Source: Publication.

Applied name Herrin Coal Member of Dugger Formation in Indiana.

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