| Kfr - Fruitland Formation coal zone (Upper Cretaceous), known or certain |
| Kfr - Fruitland Formation coal zone (Upper Cretaceous), inferred |
| Kfr3 - Fruitland 3 coal bed (Upper Cretaceous), known or certain |
| Kfr3 - Fruitland 3 coal bed (Upper Cretaceous), inferred |
| Kfr2 - Fruitland 2 coal bed (Upper Cretaceous), known or certain |
| Kfr2 - Fruitland 2 coal bed (Upper Cretaceous), inferred |
| Kfr1 - Fruitland 1 coal bed (Upper Cretaceous), known or certain |
| Kfr1 - Fruitland 1 coal bed (Upper Cretaceous), inferred |
| Kch - Cliff House Sandstone (Upper Cretaceous), inferred |
| Kmfaz - Menefee Formation, Allison Member, coal zone (Upper Cretaceous), known or certain |
| Kmfaz - Menefee Formation, Allison Member, coal zone (Upper Cretaceous), inferred |
| Kmfc3 - Menefee Formation, Cleary No. 3 coal bed (Upper Cretaceous), inferred |
| Kmfz - Menefee Formation coal zone (Upper Cretaceous), known or certain |
| Kcg - Crevasse Canyon Formation, Gibson Coal Member (Upper Cretaceous (Santonian)), known or certain |
| Kcg - Crevasse Canyon Formation, Gibson Coal Member (Upper Cretaceous (Santonian)), inferred |
| Kcdi - Crevasse Canyon Formation, Dilco Coal Member (Upper Cretaceous (Coniacian)), known or certain |