Breathitt Formation is informally elevated to group rank and subdivided into the following eight informal formations: Pocahontas, Bottom Creek, Alvy Creek, Grundy, Pikeville, Hyden, Four Corners, and Princess formations. A shale sequence overlying the Hagy coal bed is herein informally called the Molus shale member and assigned to the Grundy formation. Underlies Mason coal bed. [Revisions made in this paper are strongly contested by C. Rice and other USGS scientists who work in this area (oral commun., 9/3/93).]

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

Corr. chart. Molus shale member (informal) of Grundy Formation of Breathitt Group. Shale and/or mudstone. Recognized in eastern and southeastern Kentucky in Grundy Formation, between the informal Partridge shale member above and Dave Branch shale member below. In eastern Kentucky [Big Sandy district] lies below the Millard (Glamorgan) coal bed and above the Hagy coal zone; in southeastern Kentucky [Upper Cumberland River district] lies below the Mason (Chemoa) coal bed and above the Splitseam coal bed. Correlative with the "Eagle shale (limestone)" in Norton Formation of Virginia. Age is Early Pennsylvanian (Westphalian; Morrowan). [Hagy coal zone approx. = the Lower War Eagle coal bed of West Virginia, which Peppers (1996, GSA Memoir 188, pl.) placed in uppermost Westphalian A, RADIIZONATES ALIGERENS (RA) miospore assemblage zone of western Europe.]
[See also Chesnut, 1997 (revised Oct. 12, 1999), Stratigraphy of the coal-bearing strata of the Eastern Kentucky coal field, available online through the Kentucky Geol. Survey (http://www.uky.edu/KGS/coal/coalcorrel.htm).]

Source: Publication.