Historical:Purington Shale Member
M. E. Hopkins and J. A. Simon
The Purington Shale Member of the Carbondale Formation (Wanless, 1931a, p. 184, 188, 192) is named for the Purington Brick Company pit at East Galesburg, Knox County.
The Purington Brick Company pit exposes the type section (SW 17, 11N-2E) (Wanless, 1956, p. 10).
Extent and Thickness
The Purington is a widespread gray shale that overlies the Oak Grove Limestone and attains a maximum thickness of about 50 feet in western and northern Illinois.
It commonly contains marine fossils and sideritic concretions in the bottom part and becomes silty and sandy toward the top.
WANLESS, H. R., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
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