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

• Earth sciences portal
• United States portal
• Paleontology portal

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