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Class: Chondrichthyes
Order: Lamniformes
Family: Ptychodontidae
Common: Shell-Crushing
Genus List: Ptychodus
Formation List: Eagle Ford/Atco
Age List: Coniacian
Formation: Eagle Ford/Atco
Ellis County | MID-805
Age: Coniacian
Formation: Eagle Ford/Atco
Ellis County | MID-806
Age: Coniacian
Formation: Eagle Ford/Atco
Ellis County | MID-807
Age: Coniacian
Formation: Eagle Ford/Atco
Grayson County | PO-586
Age: Coniacian
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