// Workers AI · dad joke modeWhat did the Cotter Formation say? "I'm a rock-solid formation.

Cotter Formation
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

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.

References

↑ 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.
↑ "Cotter Dolomite". Archived from the original on 2014-07-14. Retrieved 2014-07-11.
↑ 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
↑ 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". Retrieved 17 December 2021.

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