Little Vermilion Limestone Member
Lithostratigraphy: McLeansboro Group >>Bond Formation >>Little Vermilion Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence
Primary source
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Contributing author(s)
M. E. Hopkins and J. A. Simon
Name
Original description
The Little Vermilion Limestone Member of the Bond Formation (Willman, in Cooper, 1945. p. 14).
Derivation
Named for the Little Vermilion River in La Salle County.
Other names
History/background
Type section
Type location
The type section is exposed along Little Vermilion River (SW SW 11, 33N-1E) (Wanless, 1956, p. 12).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
The Little Vermilion Limestone lies about 25 feet above the La Salle Limestone.
Extent and thickness
The Little Vermilion Limestone is as much as 4 feet thick locally.
Lithology
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.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
It is very fossiliferous, with brachiopods (particularly Rhipidomella), bryozoans, and crinoids abundant.
Age and correlation
The Little Vermilion is tentatively correlated with the Sorento Limestone.
Environments of deposition
Economic importance
Remarks
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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