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Class: Bivalvia-Oysters
| Order | Family | Common | count |
|---|---|---|---|
| Ostreida | Gryphaeidae |
Foam Oysters | 12 |
| Ostreida | Ostreidae |
Pearl Oysters | 4 |
| Ostreida | _None |
5 |
Formation: Austin Chalk
Travis County | T3-2
Formation: Austin Chalk
Williamson County | 3
Formation: Del Rio
Travis County | T2-13
Formation: Edwards Limestone
Kerr County | K1-14
Formation: Austin Chalk
Travis County | 36
Formation: Del Rio
Travis County | T2-69
Formation: Del Rio
Edwards County | 72
Formation: Austin Chalk
Travis County | 75
Formation: Del Rio
Travis County | 583
Formation: Eagle Ford
Williamson County | 584
Formation: Austin Chalk
Williamson County | W1-682
Formation: Austin Chalk
Williamson County | W1-683
Formation: Austin Chalk
Travis County | 585
Formation: Eagle Ford/Atco
Grayson County | PO-604
Formation: Eagle Ford/Atco
Grayson County | PO-666
Formation: Eagle Ford/Atco
Grayson County | PO-669
Formation: Austin Chalk
Travis County | 267
Formation: Austin Chalk
Williamson County | W1-493
Formation: Austin Chalk
Williamson County | W1-494
Formation: Austin Chalk
Williamson County | W1-676
Formation: Austin Chalk
Williamson County | W1-677
