Ozan Formation

Geological formation in the United States

Ozan Formation
Stratigraphic range: Cretaceous
Fossil ammonites from the Ozan Formation
Type	Formation
Sub-units	Austin Group
Underlies	Annona Chalk
Overlies	Austin Chalk, Brownstown Marl
Thickness	150 to 250 feet^[1]
Location
Region	Arkansas, Oklahoma
Country	United States
Type section
Named by	C.H. Dane^[2]

The Ozan Formation is a geologic formation in Arkansas, Oklahoma^[1] and Texas. It preserves fossils dating back to the Cretaceous period.

Paleofauna

Ostracods

Alatacythere

A. ponderosana^[3]

Amphicytherur

A. dubia^[3]

Bairdoppilata

B. rotunda^[3]

Brachycythere

B. ledaforma^[3]

B. rhomboidalis^[3]

B. sphenoides^[3]

Bythocypris

B. windhami^[3]

Clithrocytheridea

C. fabaformis^[3]

Cytheris

C. bicornis^[3]

C. caudata^[3]

C. communis^[3]

C. costatana^[3]

C. dallasensis^[3]

C. hannai^[3]

C. paraustinensis^[3]

C. plummeri^[3]

C. spoori^[3]

C. verricula^[3]

Cytherella

C. austinensis^[3]

Cytherelloidea

C. crafti^[3]

C. ozanana^[3]

C. spiralia^[3]

C. tollettensis^[3]

Cytheropteron

C. blakei^[3]

Haplocytheridea

H. bruceclarki^[3]

H. councilli^[3]

H. globosa^[3]

H. insolita^[3]

H. micropunctata^[3]

H. plummeri^[3]

Krithe

K. cushmani^[3]

K. postporjecta^[3]

Loxoconcha

L. fletcheri^[3]

Monoceratina

M. montuosa^[3]

M. pedata^[3]

M. prothroensis^[3]

Orthonotacythere

O. hannai^[3]

Phacorhabdots

P. texanus^[3]

Pterygocythere

P. saratogana^[3]

Veenia

V. arachoides^[3]

V. gapensis^[3]

V. ozanana^[3]

Velarocythere

V. reesidei^[3]

Avians

Hesperornis^[4]

Outcrops

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)
Another view of the same location (c. 1902)

References

^ ^a ^b McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 29. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-12.
^ Dane, C.H. (10 September 1926). U.S. Geological Survey Press Bulletin (8823). {{cite journal}}: Missing or empty |title= (help)
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al ^am ^an ^ao ^ap ^aq Collins, Jr., Robert J. (June 1960). Stratigraphy and Ostracoda of the Ozan, Annona, and Marlbrook Formations of southwestern Arkansas (PhD). Louisiana State University and Agricultural and Mechanical College.
^ Bell, Alyssa; Irwin, Kelly J.; Davis, Leo Carson (2015). "Hesperornithiform birds from the Late Creaceous (Campanian) of Arkansas, USA". Transactions of the Kansas Academy of Science. 118 (3/4): 219–229. doi:10.1660/062.118.0305. JSTOR 24887762. S2CID 83921936 – via JSTOR.