Powell Formation

The Powell Formation or Powell Dolomite is a geologic formation in northern Arkansas, southeast Missouri[3] and Virginia. It contains gastropod, cephalopod, and trilobite fossils dating back to the Ordovician Period.[3]

Powell Formation Stratigraphic range: Ordovician
Type	Formation
Underlies	Everton Formation
Overlies	Cotter Formation[1]
Lithology
Primary	Dolomite
Other	Shale, sandstone, chert
Location
Region	Arkansas, Missouri and Virginia
Country	United States
Type section
Named for	Powell railroad station (now abandoned), Marion County, Arkansas[2]
Named by	Edward Oscar Ulrich

See also

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

References

1. 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 230
2. Purdue, A.H.; Miser, H.D. (1916). "Description of the Eureka Springs and Harrison quadrangles". U.S. Geological Survey Geologic Atlas of the United States. 202: 2, 4, 5, 6, 7, 9, 16, 17, 18, 20, 21.
3. "Powell Dolomite/Formation". Archived from the original on 2014-07-14. Retrieved 2014-07-11.

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