Powell Formation Explained

Powell Formation
Type:	Formation
Age:	Ordovician
Period:	Ordovician
Prilithology:	Dolomite
Otherlithology:	Shale, sandstone, chert
Namedfor:	Powell railroad station (now abandoned), Marion County, Arkansas^[1]
Namedby:	Edward Oscar Ulrich
Region:	Arkansas, Missouri and Virginia
Country:	United States
Underlies:	Everton Formation
Overlies:	Cotter Formation^[2]

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]

See also

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

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 17 December 2021.

Notes and References

1. Purdue. A.H.. Miser. H.D.. Description of the Eureka Springs and Harrison quadrangles. U.S. Geological Survey Geologic Atlas of the United States. 1916. 202. 2, 4, 5, 6, 7, 9, 16, 17, 18, 20, 21.
2. http://www.dnr.mo.gov/geology/geosrv/ogc/docs/RI-073.pdf 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
3. Web site: Powell Dolomite/Formation . 2014-07-11 . https://web.archive.org/web/20140714131645/http://www.geology.ar.gov/geology/ozark_ordovician.htm . 2014-07-14 . dead .