Cotter Formation

The Cotter Formation is a geologic formation in Arkansas,[2] Missouri,[3] Oklahoma[4] and in Virginia. It preserves fossils dating back to the Ordovician period.

Cotter Formation Stratigraphic range: Ordovician
Type	Formation
Underlies	Powell Formation
Overlies	Jefferson City Formation
Lithology
Primary	Dolomite
Other	Chert, sandstone, shale
Location
Region	Arkansas, Missouri, Oklahoma, Virginia
Country	United States
Type section
Named for	Cotter, Baxter County, Arkansas
Named by	Edward Oscar Ulrich[1]

See also

• List of fossiliferous stratigraphic units in Arkansas
• List of fossiliferous stratigraphic units in Virginia
• Paleontology in Arkansas
• Paleontology in Virginia

References

1. Purdue, A.H.; Miser, Hugh D. (1916). "Description of the Eureka Springs and Harrison quadrangles" (PDF). U.S. Geological Survey Geologic Atlas of the United States. 202: 4.
2. "Cotter Dolomite". Archived from the original on 2014-07-14. Retrieved 2014-07-11.
3. Thompson, Thomas L., 2001, Lexicon of Stratigraphic Nomenclature in Missouri, Missouri Department of Natural Resources, Division of Geology and Land Survey, Report of Investigation Number 73, p 72-3
4. McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 3–4. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-10.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.