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St. Louis Limestone

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Other
  
Named by
  
Englemann

Region
  
Named for
  
St. Louis

Thickness
  
up to 100 feet (30 m)

Country
  
Year defined
  
1847

Primary
  
Overlies
  
Salem Formation

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.

References

St. Louis Limestone Wikipedia


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