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Class: Echinoidea
| Order | Family | Common | count |
|---|---|---|---|
| Spatangoida | Hemiasteridae |
2 | |
| Spatangoida | NaN | 3 |
Formation: Buda
Williamson County | W2-738
Formation: Buda
Williamson County | W2-771
Formation: Glen Rose
Bandera County | B1-715
Formation: Austin Chalk
Travis County | W1-511
Formation: Austin Chalk
Williamson County | W1-774
