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Class: Bivalvia
Order: Arcida
Family: Arcidae
Common: Ark
Genus List: Arca
Formation List: Austin Chalk, Glen Rose
Age List: Albian, Santonian Coniacian
Formation: Glen Rose
Kerr County | K4-827
Age: Albian
Formation: Austin Chalk
Williamson County | W1-1021
Age: Santonian Coniacian
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