Historical:Purington Shale Member
Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Purington Shale Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
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.
Type Section
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.
Description
It commonly contains marine fossils and sideritic concretions in the bottom part and becomes silty and sandy toward the top.
References
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.
ISGS Codes
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