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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.[3] It preserves fossils dating back to the Ordovician period.

Jefferson City Formation
Stratigraphic range: Early Ordovician
UnderliesCotter Dolomite
OverliesRoubidoux Formation[1]
OtherChert, sandstone
RegionArkansas, Missouri
CountryUnited States
Type section
Named forJefferson City, Cole County, Missouri[2]
Named byArthur Winslow

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 145
  2. ^ Winslow, A. (1894). "Lead and zinc deposits, section 1". Geological Survey of Missouri. 6: 331, 373, 375.
  3. ^ Ordovician of the Ozark Plateau

Coordinates: 36°37′30″N 90°49′50″W / 36.62500°N 90.83056°W / 36.62500; -90.83056