Rosiclare Sandstone Member

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Lithostratigraphy: Pope Megagroup >>Aux Vases Sandstone >>Rosiclare Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series >>Genevievian Stage
Allostratigraphy: Kaskaskia 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)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback


Original description

The Rosiclare Sandstone Member of the Aux Vases Sandstone (Ulrich and Smith, 1905, p. 24, 40; Swann, 1963, p. 80).


Named for Rosiclare, Hardin County.

Other names


As originally defined, the Rosiclare Sandstone was a member of the Ste. Genevieve Limestone, and the name was widely misapplied to the sandstone now called the Spar Mountain Sandstone Member of the Ste. Genevieve. However, the type Rosiclare was found to be equivalent to the Aux Vases Sandstone (Swann and Atherton, 1948; Swann, 1963). The Rosiclare Sandstone has long been correctly correlated throughout the eastern part of the Illinois Basin, where it is an important oil producer. Consequently, the name "Rosiclare" is retained for a member of the Aux Vases.

Type section

Type location

The type section of the Rosiclare Sandstone Member is in the Ohio River bluffs just below the town of Rosiclare (NW SE and SW SE 5, 13S-8E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Rosiclare is the main body of the Aux Vases in the area where it overlies the Joppa Member of the Ste. Genevieve and, therefore, does not include lateral equivalents of the Ste. Genevieve Limestone.

Extent and thickness

It is commonly 20-40 feet thick.





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.
SWANN, D. H., and ELWOOD ATHERTON, 1948, Subsurface correlations of lower Chester strata of the Eastern Interior Basin, in Symposium on problems of Mississippian stratigraphy and correlation: Journal of Geology, v. 56, p. 269-287; Illinois State Geological Survey Report of Investigations 135.
ULRICH, E. O., and W. S. T. SMITH, 1905, Lead, zinc, and fluorspar deposits of western Kentucky: USGS Professional Paper 36, 218 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation