Friendsville Coal Member

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Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Friendsville Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

M. E. Hopkins and J. A. Simon


Original description

The Friendsville Coal Member of the Mattoon Formation (Fuller and Clapp, 1904, p. 2).


Named for Friendsville, Wabash County.

Other names


Type section

Type location

The type locality consists of several abandoned mines near Friendsville (13, 24, 1N-13W) (Kosanke, 1950, p. 89).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Near McCleary's Bluff in southern Wabash County it is overlain by an unnamed lenticular limestone up to 6 feet thick that contains abundant phylloid algae. The Friendsville Coal lies about 160 feet above the Reel Limestone, and its position is thought to be in the lower part of the Mattoon Formation. However, its exact relation to the Millersville (Livingston) Limestone has not been determined. In Wabash County, strata that may be equivalent to the Millersville are a complex of limestone, shale, and a few coal streaks, one of which may be equivalent to the Friendsville Coal.

Extent and thickness

The Friendsville Coal is present only in the western two-thirds of Wabash County, where it is as much as 4 feet thick.





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



FULLER, M. L., and F. G. CLAPP, 1904, Patoka, Indiana-Illinois Quadrangle: USGS Geologic Atlas Folio 105, 12p.
KOSANKE, R. M., 1950, Pennsylvanian spores of Illinois and their use in correlation: Illinois State Geological Survey Bulletin 74, 128 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation