Johnson Formation

The Johnson Formation (or Johnson Limestone) is a thick geologic formation of soft shale with thin, resistant beds of chalkier mudstone and limestone in Nebraska, Kansas, and Oklahoma rarely exposed outside of road cuts. It preserves fossils dating back to the late-Carboniferous period.^[1]

Johnson Formation
Stratigraphic range: Carboniferous[1]
Head cut of Johnson Shale in the Tuttle Creek Lake spillway freshly exposed by the 1993 flood, showing unweathered coloration. (capped by the bright Glenrock limestone member of the Red Eagle Formation)
Type	Formation
Underlies	Red Eagle Formation
Overlies	Foraker Formation
Lithology
Primary	Shale
Other	resistant beds of argillaceous mudstone to well-laminated limestones[2]
Location
Region	Midcontinent (Nebraska, Kansas, Oklahoma)[2]
Country	United States
Type section
Named for	Johnson, Oklahoma[2]

See also

• Earth sciences portal
• Kansas portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Kansas
• List of fossiliferous stratigraphic units in Nebraska
• List of fossiliferous stratigraphic units in Oklahoma
• Paleontology in Kansas
• Paleontology in Nebraska
• Paleontology in Oklahoma