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