| STRATIGRAPHIC SEQUENCE OF RAJMAHAL OPEN CAST MINE | |||
| GROUP | FORMATION | LITHOLOGY | THICKNESS RANGE (m) |
| Recent to Sub-Recent | Alluvium | -------Unconformity------- | 0 - 15 |
| Upper Gondwana | Rajmahal Traps | Rajmahal volcanic and intertrappean sandstone and shale ------Unconformity-------- | 50 |
| Lower Gondwana | Barakar | Coarse to medium grained sandstone with shale and coal | 25 - 350 |
| Coarse arkosic sandstone, pebbly at places | 15 - 150 | ||
| Talchir | Sandstones and shales tillites --------Unconformity------- Granite genesis, hornblende Schists and pigmatites | 10 - 20 | |