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]
See also
- 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
References
- ^ Robert S. Sawin, Ronald R. West, Evan K. Franseen, W. Lynn Watney (January 2006). "Carboniferous-Permian Boundary in Kansas, Midcontinent, U.S.A". Current Research in Earth Sciences. 252 (1)
... the Carboniferous-Permian boundary in Kansas can now be confidently defined. Based [on fossil changes, the] boundary in Kansas can be placed at the base of the Bennett Shale Member of the Red Eagle Limestone [which the Johnson underlies].