St. Louis Limestone

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St. Louis Limestone
Stratigraphic range: Mississippian Sub-period
Type Geological formation
Underlies Ste. Genevieve Limestone
Overlies Salem Formation[1]
Thickness up to 100 feet (30 m)[2]
Primary Limestone
Other Shale, chert[2]
Region Illinois, Indiana, and Missouri
Country United States
Type section
Named for St. Louis, Missouri[1]
Named by Englemann
Year defined 1847

The St. Louis Limestone is a large geologic formation covering a wide area of the midwest of the United States. It is named after an exposure at St. Louis, Missouri. It consists of sedimentary limestone with scattered chert beds, including the heavily chertified Lost River Chert Bed in the Horse Cave Member. It is exposed at the surface through western Kentucky and Middle Tennessee, including the city of Clarksville, Tennessee. The limestone deposit is Mississippian in age, in the Meramecian series, roughly 330-340 million years old.

Fossils commonly found in the St. Louis include the rugosan corals Lithostrotion and Lithostrotionella and the bryozoan Fenestrellina.

See also[edit]