| Age (approx.) | Group | Formation | Thickness (approx.) (m) |
| Recent |
| Alluvium |
|
| Plio-Pleistocene |
| Dupitila | 500 |
| Pliocene | Tipam Group | Girujan Clay | 30
1250 |
| Tipam Sandstone | |||
| Miocene | Surma Group | Bokabil | 2700 |
| Bhuban | 640 |