Johns Valley Formation

The Johns Valley Formation is a geologic formation in Arkansas and Oklahoma.^[2] It preserves fossils dating back to the Carboniferous period.

Johns Valley Formation
Stratigraphic range: Carboniferous: Pennsylvanian
Type	Formation
Underlies	Atoka Formation
Overlies	Jackfork Sandstone
Lithology
Primary	Shale
Other	Sandstone
Location
Region	Arkansas and Oklahoma
Country	United States
Type section
Named for	Johns Valley, Pushmataha County, Oklahoma [1]
Named by	Edward Oscar Ulrich, 1927

Paleofauna

Bryozoans

Acanthocladia A. ouachitensis[3] Fenestella F. bendensis[3] F. grandis[3] F. granularis[3] F. kosomensis[3] F. mimica[3] F. oklahomensis[3]

Leioclema L. pushmatahensis[3] Rhombopora R. johnsvalleyensis[3] R. nitidula[3] Sulcoretepora S. elegans[3]

Cephalopods

Bactrites [4] Cravenoceras C. scotti [4] Cyclocerid [4] Dentoceras D. belemnitiforme [4] Eumorphoceras E. plummeri [4] Gastrioceras G. adaense [4] G. fittsi [4]

Girtyoceras G. limatum [4] Glaphyrites G. oblatus [4] G. morrowensis [4] Goniatites G. choctawensis [4] G. granosus [4] Homoceratoides H. cracens [4] Mariceras [4]

Metacoceras [4] Mitorthoceras M. perfilosum [4] Mooreoceras M. normale [4] Neoglyphioceras N. cloudi [4] Orthoceracone [4] Paracravenoceras P. ozarkense [4] Paradimorphoceras [4]

Pseudoparalegoceras P. kesslerense [4] Pseudothoceras P. knoxense [4] Rayonnoceras R. vaughanianum [4] Stenopronorites S. arkansiensis [4]

See also

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