The Johns Valley Formation is a

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

Arkansas Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...

and

Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...

. It preserves

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...

dating back to the

Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carbonifero ...

period.

Paleofauna

Bryozoa Bryozoa (also known as the Polyzoa, Ectoprocta or commonly as moss animals) are a phylum of simple, aquatic invertebrate animals, nearly all living in sedentary colonies. Typically about long, they have a special feeding structure called a l ...
ns

*'' Acanthocladia'' :''A. ouachitensis'' *''

Fenestella Fenestella (c. 52 BC – c. AD 19) was a Roman historian and encyclopaedic writer. Biography He flourished in the reign of Tiberius. According to Jerome, he lived from 52 BC to AD 19 (according to others 35 BC – AD 36).Pliny the Elder, '' Natur ...

'' :''F. bendensis'' :''F. grandis'' :''F. granularis'' :''F. kosomensis'' :''F. mimica'' :''F. oklahomensis'' *'' Leioclema'' :''L. pushmatahensis'' *'' Rhombopora'' :''R. johnsvalleyensis'' :''R. nitidula'' *'' Sulcoretepora'' :''S. elegans''

Cephalopod A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...
s

* '' Bactrites'' * ''

Cravenoceras ''Cravevoceras'' is an Upper Paleozoic ammonite in the goniatite family Cravenoceratidae, probably derived from '' Pachylyroceras'' and contemporary with other cravenoceratid genera like '' Caenolyroceras'', '' Tympanoceras'' and later '' Alaoce ...

'' : ''C. scotti'' * '' Cyclocerid'' * '' Dentoceras'' : ''D. belemnitiforme'' * '' Eumorphoceras'' : ''E. plummeri'' * '' Gastrioceras'' : ''G. adaense'' : ''G. fittsi'' * '' Girtyoceras'' : ''G. limatum'' * '' Glaphyrites'' : ''G. oblatus'' : ''G. morrowensis'' * ''

Goniatites ''Goniatites'' is a genus of extinct cephalopods belonging to the family Goniatitidae, included in the superfamily Goniatitaceae. '' Hibernicoceras'' and '' Hypergoniatites'' are among related genera. Species Description The shell is genera ...

'' : ''G. choctawensis'' : ''G. granosus'' * '' Homoceratoides'' : ''H. cracens'' * '' Mariceras'' * ''

Metacoceras ''Metacoceras'' is a nautilitoid cephalopod from the Upper Carboniferous (Pennsylvanian) and Permian, the shell of which is moderately evolute with a subquadrate whorl section, bearing nodes on the ventral or umbilical shoulders or both, but ot ...

'' * '' Mitorthoceras'' : ''M. perfilosum'' * '' Mooreoceras'' : ''M. normale'' * '' Neoglyphioceras'' : ''N. cloudi'' * '' Orthoceracone'' * '' Paracravenoceras'' : ''P. ozarkense'' * '' Paradimorphoceras'' * '' Pseudoparalegoceras'' : ''P. kesslerense'' * '' Pseudothoceras'' : ''P. knoxense'' * ''

Rayonnoceras ''Rayonnoceras'' is a genus of extinct cephalopods that lived around 325 million years ago during the Carboniferous. Although they resemble earlier actinocerids they are now though to belong to the PseudorthoceridaKröger, Björn, & Mapes, Royal ...

'' : ''R. vaughanianum'' * '' Stenopronorites'' : ''S. arkansiensis''

References

* Carboniferous Arkansas Carboniferous geology of Oklahoma Carboniferous southern paleotropical deposits {{Oklahoma-geologic-formation-stub

Paleofauna

Bryozoa Bryozoa (also known as the Polyzoa, Ectoprocta or commonly as moss animals) are a phylum of simple, aquatic invertebrate animals, nearly all living in sedentary colonies. Typically about long, they have a special feeding structure called a l ...ns

Cephalopod A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...s

See also

References

Bryozoa Bryozoa (also known as the Polyzoa, Ectoprocta or commonly as moss animals) are a phylum of simple, aquatic invertebrate animals, nearly all living in sedentary colonies. Typically about long, they have a special feeding structure called a l ...
ns

Cephalopod A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...
s