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

References

1. Ulrich, E.O. (1927). "Fossiliferous boulders in the Ouachita "Caney" shale and the age of the shale containing them". Oklahoma Geological Survey Bulletin. 45: 6, 21–23, 30, 36–37.
2. "Stratigraphic Summary of the Arkansas River Valley and Ouachita Mountains". Arkansas Geological Survey. Archived from the original on 2018-05-29. Retrieved 2017-12-15.
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: 51–53.

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