Historical:Bernadotte Sandstone Member
Lithostratigraphy: McCormick Group >>Abbott Formation >>Bernadotte Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Atokan Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Bernadotte Sandstone Member (Savage, 1927, p. 307-316), which forms the top of the Abbott Formation in western Illinois, is named for the former town of Bernadotte, Fulton County.
Type Section
The type locality is near the former town of Bernadotte (SW 19, 5N-2E) (Wanless, 1956, p. 9; 1957, p. 70-72, 103).
Correlation
The Bernadotte is correlated with the Murray Bluff Sandstone of southern Illinois.
Extent and Thickness
The Bernadotte Sandstone is fairly extensive in western Illinois and attains thicknesses of 18 feet, though it commonly averages about 5 feet.
Description
It is very fine grained, only slightly micaceous, and the upper part is commonly cemented with silica. The Bernadotte differs from most Pennsylvanian sandstones in generally having a flat base and an uneven top, on the thicker parts of which overlying stratigraphic units tend to wedge out (Wanless, 1957).
References
SAVAGE, T. E., 1927, Significant breaks and overlaps in the Pennsylvanian rocks of Illinois: American Journal of Science, v. 14, p. 307-316.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
ISGS Codes
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