Ozan Formation

Geological formation in the United States From Wikipedia, the free encyclopedia

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

TypeFormation
Sub-unitsAustin Group
UnderliesAnnona Chalk
OverliesAustin Chalk, Brownstown Marl
Quick facts Type, Sub-units ...
Ozan Formation
Stratigraphic range: Cretaceous
Fossil ammonites from the Ozan Formation
TypeFormation
Sub-unitsAustin Group
UnderliesAnnona Chalk
OverliesAustin Chalk, Brownstown Marl
Thickness150 to 250 feet[1]
Location
RegionArkansas, Oklahoma
CountryUnited States
Type section
Named byC.H. Dane[2]
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Paleofauna

Ostracods

  • Alatacythere
A. ponderosana[3]
  • Amphicytherura
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]
  • Cythereis
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]
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. postprojecta[3]
  • Loxoconcha
L. fletcheri[3]
  • Monoceratina
M. montuosa[3]
M. pedata[3]
M. prothroensis[3]
  • Orthonotacythere
O. hannai[3]
  • Phacorhabdotus
P. texanus[3]
  • Pterygocythere
P. saratogana[3]
  • Veenia
V. arachoides[3]
V. gapensis[3]
V. ozanana[3]
  • Velarocythere
V. reesidei[3]

Avians

Reptiles

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

See also

References

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