Rock Branch Coal Member

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Lithostratigraphy: McLeansboro Group >>Modesto Formation >>Rock Branch 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

Name

Original description

The Rock Branch Coal Member of the Modesto Formation (Kosanke et al., 1960, p. 37).

Derivation

Named for Rock Branch in Macoupin County.

Other names

It previously was called the Scottville Coal (Payne, 1942, p. 4).

History/background

Type section

Type location

The type section consists of exposures along Rock Branch (SW SW NW 16, 12N-9W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

This thin coal occurs in southwestern Illinois.

Lithology

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

The Rock Branch Coal may be equivalent to the Pond Creek Coal of southern Illinois.

Environments of deposition

Economic importance

Remarks

References

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.
PAYNE, J. N., 1942, Structure of Herrin (No. 6) coal bed in Macoupin County, eastern Jersey and Greene, southeastern Scott, and southern Morgan and Sangamon Counties: Illinois State Geological Survey Circular 88, 46 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
2410
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