Ozan Formation
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The Ozan Formation is a geologic formation in Arkansas,
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 ...
and Texas. 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 Cretaceous period.


Paleofauna


Ostracods Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typical ...

*'' Alatacythere'' :''A. ponderosana'' *'' Amphicytherur'' :''A. dubia'' *'' Bairdoppilata'' :''B. rotunda'' *'' Brachycythere'' :''B. ledaforma'' :''B. rhomboidalis'' :''B. sphenoides'' *'' Bythocypris'' :''B. windhami'' *'' Clithrocytheridea'' :''C. fabaformis'' *'' Cytheris'' :''C. bicornis'' :''C. caudata'' :''C. communis'' :''C. costatana'' :''C. dallasensis'' :''C. hannai'' :''C. paraustinensis'' :''C. plummeri'' :''C. spoori'' :''C. verricula'' *''
Cytherella ''Cytherella'' is a genus of ostracod, seed shrimp in the family Cytherellidae. Species The World Register of Marine Species lists the following species as accepted in the genus ''Cytherella''. *''Cytherella abyssorum'' *''Cytherella adenen ...
'' :''C. austinensis'' *'' Cytherelloidea'' :''C. crafti'' :''C. ozanana'' :''C. spiralia'' :''C. tollettensis'' *'' Cytheropteron'' :''C. blakei'' *'' Haplocytheridea'' :''H. bruceclarki'' :''H. councilli'' :''H. globosa'' :''H. insolita'' :''H. micropunctata'' :''H. plummeri'' *'' Krithe'' :''K. cushmani'' :''K. postporjecta'' *'' Loxoconcha'' :''L. fletcheri'' *'' Monoceratina'' :''M. montuosa'' :''M. pedata'' :''M. prothroensis'' *'' Orthonotacythere'' :''O. hannai'' *'' Phacorhabdots'' :''P. texanus'' *'' Pterygocythere'' :''P. saratogana'' *'' Veenia'' :''V. arachoides'' :''V. gapensis'' :''V. ozanana'' *'' Velarocythere'' :''V. reesidei''


Avians Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...

*'' Hesperornis''


Outcrops

File:Bulletin 429 Plate XVI B Annona Chalk Brownstown Marl.jpg, Annona Chalk overlying Ozan Formation at what is now called White Cliffs Natural Area, with the Little River in the foreground, Howard County, AR (c. 1910) File:Plate XLVIII Chalk Bluff at Whitecliffs Landing.jpg, Another view of the same location (c. 1902)


See also

* List of fossiliferous stratigraphic units in Arkansas *
Paleontology in Arkansas Paleontology in Arkansas refers to paleontological research occurring within or conducted by people from the United States, U.S. state of Arkansas. The fossil Fossil record, record of Arkansas spans from the Ordovician to the Eocene. Nearly all of ...


References

* Cretaceous geology of Oklahoma Cretaceous Arkansas Cretaceous geology of Texas {{Cretaceous-stub