St. Louis Limestone facts for kids
Quick facts for kidsSt. Louis Limestone
Stratigraphic range: Mississippian Sub-period
Rock anhydrite (St. Louis Limestone; subsurface gypsum mine in Martin County, Indiana)
|Unit of||Blue River Group|
|Sub-units||Dover Chert, Horse Cave Member, Sisson Member|
|Underlies||Ste. Genevieve Limestone|
|Thickness||up to 100 feet (30 m)|
|Region||Illinois, Indiana, Tennessee, Kentucky and Missouri|
|Named for||St. Louis, Missouri|
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.
St. Louis Limestone Facts for Kids. Kiddle Encyclopedia.