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Class: Echinoidea
| Order | Family | Common | count |
|---|---|---|---|
| Euechinoidea | Pseudodiadematidae |
4 |
Formation: Walnut
Travis County | T1-700
Formation: Glen Rose
Kerr County | K4-863
Formation: Fort Terrett
Kerr County | K1-862
Formation: Comanche Peak
Coryell County | 855
