Johnson Formation
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] |
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[]
- ^ Jump up to: a b 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].
CS1 maint: multiple names: authors list (link) - ^ Jump up to: a b c Jewett, John M. (1941). The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39. University of Kansas Publications, State Geological Survey of Kansas.
Categories:
- Carboniferous geology of Oklahoma
- Carboniferous Kansas
- Carboniferous geology of Nebraska
- Carboniferous southern paleotropical deposits
- Kansas geologic formation stubs
- Midwestern United States geologic formation stubs
- Nebraska geography stubs
- Oklahoma geologic formation stubs
- Carboniferous stubs