Historical:Ramp Creek Limestone Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Ullin Limestone >>Ramp Creek Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Ramp Creek Limestone Member of the Ullin Limestone (Stockdale, 1929, p. 233-242) is named for the village of Ramp Creek, Monroe County, Indiana. The name "Ramp Creek" was originally applied to the lower part of the Harrodsburg Limestone, but Harrodsburg was later restricted to the upper, purer limestone (Smith, 1965).

Type Section

The type section of the Ramp Creek Limestone Member is located near Ramp Creek, Monroe County, Indiana, in an exposure of 21 feet of siliceous and argillaceous limestone (NW NW 35, 8N-1W).

Extent and Thickness

The Ramp Creek is 0-490 feet thick.

Stratigraphic Position

The Ramp Creek in Illinois is the lower, cherty, argillaceous limestone of the Ullin (Lineback, 1966).


The Ramp Creek includes the brachiopod Marginirugus magnus Zone.


LINEBACK, J. A., 1966, Deep-water sediments adjacent to the Borden Siltstone (Mississippian) delta in southern Illinois: Illinois State Geological Survey Circular 401, 48 p.
SMITH, N. M., 1965, Sanders Group and subjacent Muldraugh Formation (Mississippian) in Indiana: Indiana Geological Survey Report of Progress 29, 20 p.
STOCKDALE, P. B., 1929, Stratigraphic units of the Harrodsburg Limestone: Indiana Academy of Science Proceedings, 1928, v. 38, p. 233-242.

ISGS Codes

Stratigraphic Code Geo Unit Designation