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