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Class: Bivalvia
| Order | Family | Common | count |
|---|---|---|---|
| Arcida | Arcidae |
Ark | 1 |
| Arcida | Cucullaeidae |
False Ark Shells | 5 |
Formation: Glen Rose
Kerr County | K4-827
Formation: Austin Chalk
Williamson County | W1-687
Formation: Comanche Peak
Bell County | BL2-913
Formation: Comanche Peak
Bell County | BL2-914
Formation: Fort Terrett
Kerr County | K1-915
Formation: Glen Rose
Bandera County | B2-726
