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| Group | Order | Common | count |
|---|---|---|---|
| Caenogastropoda | Caenogastropoda |
8 | |
| Caenogastropoda | Littorinimorpha |
Littoral zone | 14 |
| Caenogastropoda | Neogastropoda |
10 | |
| Heterobranchia | Heterobranchia |
1 | |
zNone |
12 |
>Order: Caenogastropoda
Formation: Comanche Peak
Williamson County | 9
Formation: Stone City
Burleson County | WB-91
Formation: Austin Chalk
Williamson County | W1-641
Formation: Eagle Ford/Atco
Grayson County | PO-600
Formation: Buda
Williamson County | W2-581
Formation: Buda
Williamson County | W2-17
Formation: Stone City
Burleson County | WB-353
Formation: Stone City
Burleson County | WB-357
>Order: Heterobranchia
Formation: Edwards Limestone
Kerr County | K1-709
>Order: Littorinimorpha
Formation: Walnut
Travis County | T1-70
Formation: Glen Rose
Comal County | 192
Formation: Edwards Limestone
Kerr County | K1-54
Formation: Edwards Limestone
Kerr County | K1-719
Formation: Stone City
Burleson County | WB-356
Formation: Austin Chalk
Williamson County | W1-697
Formation: Walnut
Travis County | T1-701
Formation: Walnut
Travis County | T1-699
Formation: Edwards Limestone
Kerr County | K1-711
Formation: Comanche Peak
Lampasas County | L1-462
Formation: Walnut
Travis County | T1-21
Formation: Buda
Williamson County | W2-694
Formation: Edwards Limestone
Kerr County | K1-710
Formation: Stone City
Burleson County | WB-92
>Order: Neogastropoda
Formation: Stone City
Burleson County | WB-5
Formation: Stone City
Burleson County | WB-364
Formation: Stone City
Burleson County | WB-411
Formation: Stone City
Burleson County | WB-361
Formation: Stone City
Burleson County | WB-532
Formation: Stone City
Burleson County | WB-534
Formation: Stone City
Burleson County | WB-354
Formation: Stone City
Burleson County | WB-365
Formation: Stone City
Burleson County | WB-10
Formation: Stone City
Burleson County | WB-533
>Order: zNone
Formation: Austin Chalk
Williamson County | W1-672
Formation: Austin Chalk
Williamson County | W1-681
Formation: Buda
Williamson County | W2-695
Formation: Walnut
Travis County | T1-698
Formation: Walnut
Travis County | T1-702
Formation: Walnut
Travis County | T1-703
Formation: Austin Chalk
Williamson County | W1-716
Formation: Austin Chalk
Williamson County | W1-717
Formation: Austin Chalk
Williamson County | 575
Formation: Glen Rose
Comal County | 190
Formation: Eagle Ford/Atco
Grayson County | PO-602
Formation: Walnut
Travis County | T1-20
| Period | Formation | count |
|---|---|---|
| Cretaceous | Austin Chalk | 7 |
| Cretaceous | Buda | 4 |
| Cretaceous | Comanche Peak | 2 |
| Cretaceous | Eagle Ford/Atco | 2 |
| Cretaceous | Edwards Limestone | 5 |
| Cretaceous | Glen Rose | 2 |
| Cretaceous | Walnut | 8 |
| Eocene | Stone City | 15 |