| Fern Glen Formation | |
|---|---|
| Stratigraphic range: Mississippian Osagean | |
| Type | Formation |
| Underlies | Burlington Limestone |
| Overlies | Chouteau Group[1] |
| Lithology | |
| Primary | Limestone |
| Other | Shale, chert[2] |
| Location | |
| Country | United States |
| Extent | East central and southeastern Missouri,[2] Illinois |
| Type section | |
| Named for | Fern Glen resort on the Meramec River |
| Named by | Weller in 1906[1] |
The Fern Glen Formation is a geologic formation in eastern and southeastern Missouri. It preserves fossils dating back to the Osagean Series of the Mississippian subperiod.
The Fern Glen is richly fossiliferous with abundant crinoids, corals, brachiopods and bryozoa.[2]