# Johnson Formation

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Johnson_Formation
> Markdown URL: https://mediated.wiki/source/Johnson_Formation.md
> Source: https://en.wikipedia.org/wiki/Johnson_Formation
> Source revision: 1298308331
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

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

## See also

- [List of fossiliferous stratigraphic units in Kansas](/source/List_of_fossiliferous_stratigraphic_units_in_Kansas)
- [List of fossiliferous stratigraphic units in Nebraska](/source/List_of_fossiliferous_stratigraphic_units_in_Nebraska)
- [List of fossiliferous stratigraphic units in Oklahoma](/source/List_of_fossiliferous_stratigraphic_units_in_Oklahoma)
- [Paleontology in Kansas](/source/Paleontology_in_Kansas)
- [Paleontology in Nebraska](/source/Paleontology_in_Nebraska)
- [Paleontology in Oklahoma](/source/Paleontology_in_Oklahoma)

## References

1. Robert S. Sawin, Ronald R. West, Evan K. Franseen, W. Lynn Watney (January 2006). ["Carboniferous-Permian Boundary in Kansas, Midcontinent, U.S.A"](https://www.researchgate.net/publication/251528028). *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].

1. Jewett, John M. (1941). [*The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39*](http://www.kgs.ku.edu/General/Geology/Riley/strat03b.html). University of Kansas Publications, State Geological Survey of Kansas.

---
Adapted from the Wikipedia article [Johnson Formation](https://en.wikipedia.org/wiki/Johnson_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Johnson_Formation?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.