| Antlers (An) |
| Arbuckle-Simpson (AS) |
| Beaver Creek Alluvium and Terrace (BC) |
| Cache Creek Alluvium and Terrace (CC) |
| Elk City (EC) |
| Enid Isolated Terrace (EIT) |
| Garber-Wellington (GW) |
| Gerty Sand (GS) |
| Haworth Isolated Terrace - Regions 1 & 2 (HIT) |
| Hennessey-Garber (HG) |
| Little River Alluvium and Terrace (Li) |
| North Canadian River - Phases 1, 2, 3, & 3b (NC) |
| North Fork of the Red River (NFR) |
| Ogallala - Northwest & Panhandle (Og) |
| Post Oak (PO) |
| Tillman Terrace (TT) |
| Vamoosa-Ada (VA) |
| Washita River - Reaches 1, 2, & 3 (Wa) |
