| QTdd Dihing and Dupi Tila Formation Undivided |
| QTdi Dihing Formation (Pleistocene and Pliocene) |
| QTdt Dupi tila Formation (Pleistocene and Pliocene) |
| QTg Girujan Clay (Pleistocene and Neogene) |
| Qsm St. Marin limestone (Pleistocene) |
| Tb Bhuban Formation (Miocene) |
| Tba Barail Formation (Oligocene) |
| Tbb Boka Bil Formation (Neogene) |
| Tj Kopili Formation (Late Eocene), Sylhet Limestone (Middle to Early? Eocene), Tura Formation (Eocene and Paleocene) |
| Tt Tipam Sandstone (Neogene) |
| Areas outside of Bangladesh |
| ac Chandina alluvium |
| afo Old gravelly sand |
| afy Young gravelly sand |
| asc Alluvial silt and clay |
| asd Alluvial sand |
| asl Alluvial silt |
| ava Valley alluvium and colluvium |
| csd Beach and dune sand |
| de Estuarine deposites |
| dm Tidal mud |
| dsd Deltaic sand |
| dsl Deltaic silt |
| dsw Mangrove swamp deposit |
| dt Tidal deltaic deposits |
| Lake |
| ppc Marsh clay and peat |
| rb Barind clay residuum |
| rm Madhupur clay residuum |
