Rock Branch Coal Member
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.
M. E. Hopkins and J. A. Simon
The Rock Branch Coal Member of the Modesto Formation (Kosanke et al., 1960, p. 37).
Named for Rock Branch in Macoupin County.
It previously was called the Scottville Coal (Payne, 1942, p. 4).
The type section consists of exposures along Rock Branch (SW SW NW 16, 12N-9W).
Extent and thickness
This thin coal occurs in southwestern Illinois.
Well log characteristics
Age and correlation
The Rock Branch Coal may be equivalent to the Pond Creek Coal of southern Illinois.
Environments of deposition
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.
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