Briar Hill Coal Member

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Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Briar Hill Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian 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 Briar Hill (No. 5A) Coal Member of the Carbondale Formation (Glenn, 1912, p. 38).


Named for Briar Hill, a hill near Dekoven Station, Union County, Kentucky. The name was adopted in Illinois (Cady, 1919a, p. 20; 1926, p. 255). In Kentucky, this coal is now referred to as the No. 10 coal.

Other names


Type section

Type location

A locality in Saline County (9S-7E) was designated as representative of this coal for Illinois (Wanless, 1956, p. 10).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

In Illinois, the Briar Hill is fairly continuous in southeastern Illinois and has been recognized as far as Clark County on the northeast and Mt. Vernon on the northwest. It is generally thin and has been mined only on a small scale in the state. It extends into southwestern Indiana.


The coal is overlain by a dark gray to black shale that is fissile in places and is seldom over 2 feet thick. It is underlain by a hard silty underclay.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



CADY, G. H., 1919a, Coal resources of District V (Saline and Gallatin Counties): Illinois State Geological Survey Mining Investigations Bulletin 19, 135 p.
CADY, G. H., 1926, Areal geology of Saline County: Illinois Academy of Science Transactions, v. 19, p. 250-272.
GLENN, L. C., 1912, A geological reconnaissance of the Tradewater River region, with special reference to the coal beds: Kentucky Geological Survey Bulletin 17, 75 p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation