Roubidoux Formation

The Roubidoux Formation is a geologic formation in the Ozarks of Missouri and in Virginia. It preserves fossils dating back to the Ordovician period.

Roubidoux Formation
Stratigraphic range: Ordovician
Roubidoux sandstone bluff.JPG
Outcrop of Roubidoux sandstone in the Missouri Ozarks
UnderliesJefferson City Formation in the Missouri Ozarks
OverliesGasconade Formation[1]
Thickness100 to 300 feet[2]
Otherdolomite, chert
Coordinates36°54′N 92°34′W / 36.90°N 92.57°W / 36.90; -92.57Coordinates: 36°54′N 92°34′W / 36.90°N 92.57°W / 36.90; -92.57
RegionMissouri, Virginia
CountryUnited States
Type section
Named forRoubidoux Creek, Texas and Pulaski counties, Missouri[2]



K. oregonensis[3]
W. inexpectans[3]

See alsoEdit


  1. ^ 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
  2. ^ a b Thompson, Thomas L., Paleozoic Succession in Missouri: Part 2 Ordocician System, Report of Investigation No. 70, 1991, Missouri Department og Natural Resources, Rolla, MO, pp. 30-37
  3. ^ a b Stinchcomb, Bruce; Angeli, Nicholas (2002). "New Cambrian and Lower Ordovician monoplacophorans form the Ozark Uplift, Missouri". Journal of Paleontology. 76 (6): 965–974.