Historical:Little Vermilion Limestone Member
Lithostratigraphy: McLeansboro Group >>Bond Formation >>Little Vermilion Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Little Vermilion Limestone Member of the Bond Formation (Willman, in Cooper, 1945. p. 14) is named for the Little Vermilion River in La Salle County.
Type Section
The type section is exposed along Little Vermilion River (SW SW 11, 33N-1E) (Wanless, 1956, p. 12).
Correlation
The Little Vermilion is tentatively correlated with the Sorento Limestone.
Extent and Thickness
The Little Vermilion Limestone is as much as 4 feet thick locally.
Stratigraphic Position
The Little Vermilion Limestone lies about 25 feet above the La Salle Limestone.
Description
The limestone is dark gray, argillaceous, and shaly. In the type area a coal, generally less than 1 foot thick, is found about a foot below the limestone.
Fossils
It is very fossiliferous, with brachiopods (particularly Rhipidomella), bryozoans, and crinoids abundant.
References
COOPER, C. L., 1946, Pennsylvanian ostracodes of Illinois: Illinois State Geological Survey Bulletin 70, 177 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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