St. Joe Formation
The St. Joe Formation or St. Joe Limestone Member is a geologic formation or member in northern Arkansas, southern Missouri and northeastern Oklahoma. It preserves fossils of the Mississippian subperiod including crinoids, brachiopods, bryozoa, conodonts, blastoids, ostracods and rugose coral.
St. Joe Limestone Member | |
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Stratigraphic range: Mississippian | |
Type | Member |
Unit of | Boone Formation |
Overlies | Chattanooga Shale |
Thickness | up to 100 ft. |
Lithology | |
Primary | Limestone |
Other | Chert |
Location | |
Region | Arkansas, Missouri, Oklahoma |
Country | United States |
Type section | |
Named for | St. Joe, Searcy County, Arkansas |
Named by | T.C. Hopkins |
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