Historical:Bunje Limestone Member
M. E. Hopkins and J. A. Simon
The Bunje Limestone Member of the Bond Formation (Simon, in Kosanke et al., 1960, p. 39) is named for Bunje Station, Bond County.
The type section is about 1 mile south of Bunje Station, along Dry Fork (SE SW 7, 6N-4W).
Extent and Thickness
The Bunje is known only in the type locality, where it is generally less than 2 feet thick.
It is underlain by an unnamed sandstone unit and is commonly about 40 feet above the Sorento Limestone. The Bunje is separated from the Flat Creek Coal above by a few feet of shale and underclay.
It is very fossiliferous, having a fauna dominated by large pelecypods, and the upper few inches is characterized by cone-in-cone structure.
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.
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