| Roubidoux Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
 Outcrop of Roubidoux sandstone in the Missouri Ozarks | |
| Type | Formation |
| Underlies | Jefferson City Formation in the Missouri Ozarks |
| Overlies | Gasconade Formation[1] |
| Thickness | 100 to 300 feet[2] |
| Lithology | |
| Primary | Sandstone |
| Other | dolomite, chert |
| Location | |
| Coordinates | 36°54′N 92°34′W / 36.90°N 92.57°W |
| Region | Missouri |
| Country | United States |
| Type section | |
| Named for | Roubidoux Creek, Texas and Pulaski counties, Missouri[2] |
The Roubidoux Formation is a geologic formation in the Ozarks of Missouri. It preserves fossils dating back to the Ordovician period.
- ^ Thompson, Thomas L., 2001, Lexicon of Stratigraphic Nomenclature in Missouri, Missouri Department of Natural Resources, Division of Geology and Land Survey, Report of Investigation Number 73, p 244-245
- ^ a b Thompson, Thomas L., Paleozoic Succession in Missouri: Part 2 Ordocician System, Report of Investigation No. 70, 1991, Missouri Department of Natural Resources, Rolla, MO, pp. 30-37