Cotter Formation

The Cotter Formation is a geologic formation in Arkansas,^[2] Missouri,^[3] Oklahoma^[4] and in Virginia. It preserves fossils dating back to the Ordovician period.

Cotter Formation
Stratigraphic range: Ordovician
Type	Formation
Underlies	Powell Formation
Overlies	Jefferson City Formation
Lithology
Primary	Dolomite
Other	Chert, sandstone, shale
Location
Region	Arkansas, Missouri, Oklahoma, Virginia
Country	United States
Type section
Named for	Cotter, Baxter County, Arkansas
Named by	Edward Oscar Ulrich[1]

See also

• List of fossiliferous stratigraphic units in Arkansas
• List of fossiliferous stratigraphic units in Virginia
• Paleontology in Arkansas
• Paleontology in Virginia