Jefferson City Formation

Jefferson City Formation Stratigraphic range: Early Ordovician
Type	Formation
Underlies	Cotter Dolomite
Overlies	Roubidoux Formation
Lithology
Primary	Dolostone
Other	Chert, sandstone
Location
Region	Missouri
Country	United States
Type section
Named for	Jefferson City, Cole County, Missouri

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.