Chapel Coal Member

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Lithostratigraphy: McLeansboro Group >>Modesto Formation >>Chapel 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 Chapel (No. 8) Coal Member of the Modesto Formation (Kosanke et al., 1960, p. 38).


Named for Graham Chapel, Peoria County.

Other names

It previously was called Trivoli (No. 8) coal (Wanless, 1931a, p. 181-182, 190, 192).


The name "No. 8" was first given to this coal by Lesquereux (1866, p. 213) for an exposure near Shawneetown, Gallatin County. Worthen (1870) also applied the name to this coal in outcrops near Springfield, Sangamon County.

Type section

Type location

The type section consists of exposures in a ravine northeast of Pea Ridge School, about 2 miles south of Graham Chapel (SW 3, 8N-5E) (Wanless, 1956, p. 11; 1957, p. 121, 193).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Chapel Coal Member is the oldest named unit in the Missourian Series. It occurs above the widespread Trivoli Sandstone or the West Franklin Limestone.

Extent and thickness

The Chapel Coal is persistent throughout most of the area of the state that is underlain by the Modesto Formation.


The Chapel Coal is a thin, bright-banded coal.




Well log characteristics


Age and correlation

It is correlated with the Ditney Coal Member of southwestern Indiana.

Environments of deposition

Economic importance



KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
LESQUEREUX, LEO, 1866, Report on the coal fields of Illinois: Geological Survey of Illinois, v. 1, p. 208-237.
WANLESS, H. R., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
WORTHEN, A. H., 1870, Geology and paleontology: Geological Survey of Illinois, v. 4, 508 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation