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Class: Bivalvia-Oysters
Order: Ostreida
Family: Gryph: Exogyrinae
Common: Exogyra
Genus List: Ceratostreon, Exogyra
Formation List: Austin Chalk, Comanche Peak, Del Rio, Fort Terrett
Age List: Albian, Cenomanian, Santonian Coniacian
Formation: Fort Terrett
Kerr County | K1-947
Age: Albian
Formation: Comanche Peak
Bell County | BL1-948
Age: Albian
Formation: Fort Terrett
Kerr County | K1-949
Age: Albian
Formation: Fort Terrett
Kerr County | K1-14
Age: Albian
Formation: Austin Chalk
Travis County | T3-2
Age: Santonian Coniacian
Formation: Del Rio
Travis County | T2-13
Age: Cenomanian
Formation: Austin Chalk
Travis County | 75
Age: Santonian Coniacian
Formation: Del Rio
Edwards County | 72
Age: Cenomanian
Formation: Austin Chalk
Travis County | 36
Age: Santonian Coniacian
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