Historical:Fredonia Limestone Member
Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Ste. Genevieve Limestone >>Fredonia Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series >>Genevievian Stage
Allostratigraphy: Kaskaskia Sequence
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
The Fredonia Limestone Member of the Ste. Genevieve Limestone (Ulrich and Smith, 1905, p. 24, 40; Swann, 1963, p. 27, 66), the lowest and thickest member, is named for Fredonia, Caldwell County, Kentucky (14-I-18).
Extent and Thickness
The Fredonia is generally 80-100 feet thick, but from Effingham County north to Coles County it thins rapidly to 20 feet or less.
The Fredonia originally included the dominantly limestone section from the base of the Rosiclare Sandstone to the top of the underlying St. Louis Limestone, but it was restricted by Swann (1963) to the limestone between the base of the Spar Mountain Member and the St. Louis Limestone.
The limestone is light gray, mainly oolitic, cross-bedded, and crinoidal, but it includes some darker lithographic limestone beds like those in the St. Louis below.
Crinoids are present in the Fredonia Member.
SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.
ULRICH, E. O., and W. S. T. SMITH, 1905, Lead, zinc, and fluorspar deposits of western Kentucky: USGS Professional Paper 36, 218 p.
|Stratigraphic Code||Geo Unit Designation|