Jefferson City Formation
| Jefferson City Formation | |
|---|---|
| Stratigraphic range: Early Ordovician | |
| Type | Formation |
| Underlies | Cotter Dolomite |
| Overlies | Roubidoux Formation |
| Lithology | |
| Primary | Dolomite |
| Other | Chert, sandstone |
| Location | |
| Region | Arkansas, Missouri |
| Country | United States |
| Type section | |
| Named for | Jefferson City, Cole County, Missouri |
| Named by | Arthur Winslow |
The Jefferson City Formation or Jefferson City Dolomite is a geologic formation in the Ozarks of Missouri and Arkansas. The Jefferson City is in part not differentiated from the Cotter Formation of northern Arkansas. It preserves fossils dating back to the Ordovician period.