Historical:Ford Station 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: Pope Megagroup >>Clore Formation >>Ford Station Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Elviran Stage
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Ford Station Limestone Member of the Clore Formation (Swann, 1963, p. 40, 42), the upper member, is named for the Ford Station siding of the Missouri Pacific Railroad, Randolph County.

Type Section

The type section of the Ford Station Limestone is located near the Ford Station siding of the Missouri Pacific Railroad, Randolph County in an abandoned quarry (NW SE 33, 7S-6W).

Extent and Thickness

It is 38 feet thick in the type section but ranges from 20-50 feet thick.


It consists of interbedded limestone and shale that include rare lenses of sandstone. Most of the shale in the Ford Station Member is dark gray to dark greenish gray and is generally calcareous and fossiliferous. The limestone is gray, buff, drab, or dark brownish gray, argillaceous, and shaly . Dolomite occurs irregularly.


SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation