Moorefield Formation

The Moorefield Formation, or Moorefield Shale, is a geologic formation in northern Arkansas and eastern Oklahoma that dates to the Meramecian Series of the middle Mississippian. In Arkansas, this formation is generally recognized to have one member, the Ruddell Shale, in the upper Moorefield Formation.

Moorefield Formation Stratigraphic range: Mississippian
Type	Formation
Sub-units	Ruddell Shale
Underlies	Batesville Formation
Overlies	Boone Formation
Thickness	up to 300 feet[1]
Lithology
Primary	Shale
Other	Limestone
Location
Region	Arkansas, Oklahoma
Country	United States
Type section
Named for	Moorefield, Independence County, Arkansas
Named by	George Irving Adams and Edward Oscar Ulrich[2]

Paleofauna

Bryozoans

• Archimedes

A. confertus[3]

A. proutanus[3]

• Batostomella

B. dubla[3]

B. parvula[3]

• Tabulipora[3]

Cephalopods

• Adnatoceras[4]

A. alaskense[4]

• Bactrites

B. caronarius[4]

B. smithianus[4]

• Endolobus

E. ornatus[4]

• Girtyoceras

G. welleri[4]

• Goniaties[4]
• Mitorthoceras[4]

See also

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

References

1. McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 11. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-06-01.
2. Adams, G.; Ulrich, E. (1904). "Zinc and lead deposits of northern Arkansas". U.S. Geological Survey Professional Paper. 24: 26.
3. Horowitz, Alan S. (1977). "Late Mississippian and Early Pennsylvanian bryozoan faunas of Arkansas and Oklahoma: a review" (PDF). Oklahoma Geological Survey Guidebook. 18: 101–105. Retrieved 3 February 2018.
4. Gordon, Jr., Mackenzie (1964). "Carboniferous Cephalopods of Arkansas". U.S. Geological Survey Professional Paper. 460: 14–16.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.