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Class: Cephalopoda
Order: Ammonitida
Family: Collignoniceratidae
Common: None
Genus List: Prionocyclus, Texanites
Formation List: Austin Chalk, Eagle Ford/Atco
Age List: Coniacian, Santonian Coniacian
Formation: Eagle Ford/Atco
Ellis County | MID-810
Age: Coniacian
Formation: Austin Chalk
Travis County | 60
Age: Santonian Coniacian
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