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Class: Bivalvia
Order: Arcida
Family: Cucullaeidae
Common: False Ark Shells
Genus List: Cucullaea, Idonearca
Formation List: Austin Chalk, Comanche Peak, Fort Terrett, Glen Rose
Age List: Albian, Santonian Coniacian
Formation: Austin Chalk
Williamson County | W1-687
Age: Santonian Coniacian
Formation: Comanche Peak
Bell County | BL2-913
Age: Albian
Formation: Comanche Peak
Bell County | BL2-914
Age: Albian
Formation: Fort Terrett
Kerr County | K1-915
Age: Albian
Formation: Glen Rose
Bandera County | B2-726
Age: Albian
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