St. Joe Formation
Geologic formation or member in northern Arkansas
From Wikipedia, the free encyclopedia
The St. Joe Formation or St. Joe Limestone Member is a geologic formation or member in northern Arkansas, southern Missouri and northeastern Oklahoma.[1] It preserves fossils of the Mississippian subperiod including crinoids, brachiopods, bryozoa, conodonts, blastoids, ostracods and rugose coral.[1]
| St. Joe Limestone Member | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Member |
| Unit of | Boone Formation |
| Overlies | Chattanooga Shale |
| Thickness | up to 100 ft.[1] |
| 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[2] |
