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Class: Bivalvia
| Order | Family | Common | count |
|---|---|---|---|
| Trigoniida | Trigoniidae |
4 |
Formation: Buda
Travis County | T2-645
Formation: Glen Rose
Hays County | 382
Formation: Fort Terrett
Kerr County | K1-819
Formation: Glen Rose
Kerr County | K5-831
