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St. Louis Limestone facts for kids

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St. Louis Limestone
Stratigraphic range: Mississippian Sub-period
Rock anhydrite (St. Louis Limestone, Middle Mississippian; subsurface gypsum mine in Martin County, Indiana, USA) 2 (29999233781).jpg
Rock anhydrite (St. Louis Limestone; subsurface gypsum mine in Martin County, Indiana)
Type Geological formation
Unit of Blue River Group
Sub-units Dover Chert, Horse Cave Member, Sisson Member
Underlies Ste. Genevieve Limestone
Overlies Salem Formation
Thickness up to 100 feet (30 m)
Primary Limestone
Other Shale, chert
Region Illinois, Indiana, Tennessee, Kentucky and Missouri
Country United States
Type section
Named for St. Louis, Missouri
Named by Englemann
Year defined 1847
NPS mammoth-cave-geologic-map
Geological map of Mammoth Cave National Park, incl. St. Louis Limestone
St. Louis Limestone (Middle Mississippian; Route 460 roadcut south of Frenchburg, Kentucky, USA) 3 (46672347301)
Outcrops of the St. Louis Limestone near Frenchburg, Kentucky

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.

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