Fernvale Limestone
The Fernvale Limestone is a geologic formation in Alabama, Arkansas, Illinois, Missouri, Oklahoma, and Tennessee. It preserves fossils dating back to the Ordovician period.
| Fernvale Limestone | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Underlies | Cason Shale |
| Overlies | Kimmswick Limestone |
| Thickness | 0 to 100+ feet in Arkansas |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Arkansas, Tennessee |
| Country | United States |
| Type section | |
| Named by | Charles Willard Hayes and Edward Oscar Ulrich |
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