Rock Branch Coal Member
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
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