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.
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