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Class: Bivalvia
| Order | Family | Common | count |
|---|---|---|---|
| Myalinida | Inoceramidae |
9 |
Formation: Austin Chalk
Travis County | 7
Formation: Eagle Ford
Williamson County | 90
Formation: Austin Chalk
Williamson County | 116
Formation: Boquillas
Brewster County | 168
Formation: Austin Chalk
Williamson County | 264
Formation: Ozan
Fannin County | NS-369
Formation: Austin Chalk
Williamson County | W1-490
Formation: Eagle Ford/Atco
Grayson County | PO-667
Formation: Eagle Ford/Atco
Grayson County | PO-668
