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Class: Bivalvia
| Order | Family | Common | count |
|---|---|---|---|
| Arcida | Cucullaeidae |
False Ark Shells | 3 |
| Arcida | NaN | 2 |
Formation: Edwards Limestone
Kerr County | K2-40
Formation: Austin Chalk
Williamson County | W1-670
Formation: Austin Chalk
Williamson County | W1-673
Formation: Austin Chalk
Williamson County | W1-687
Formation: Glen Rose
Bandera County | B2-726
