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Geology
The
study of rocks of Tripura dates back to 1908 when H.C. Dasgupta first classified
the folded sedimentary rocks into 'coal measures' and ' Tripura Groups'. The
rocks encountered in Tripura state range in age from lower Tertiary (40 million
years old) to Recent (less than 1 million years old).
The
sedimentary rocks of Tripura can be divided into 'Formations', 'sub-Groups' and
'Group' on the basis of their lithological composition, depositional
characteristic and structural features.
| Group |
Sub-Group |
Formation |
Rock type |
Recent |
|
Recent
(Unconformity) |
Unconsolidated silt, and clay with decomposed vegetable matter and
gravels |
| Dupi Tila |
|
Dupi Tila
(Unconformity) |
Sandy clays, clayey sandstone,
ferruginous sandstone with pockets of plastic clay, silica and laterite. |
| Tipam |
Tipam |
Champanagar |
Sandstone, occasional sandy shale
and abundant lumps of fossil wood |
| |
|
Manu Bazar |
Sandstone with laminated layers and
lenses of sandy shale, siltstone and mudstone. |
| Surma |
(Contact
transitional)
Boka Bill |
|
Thinly bedded repetition of
sandstone, siltstone/shale, mudstone and ferruginous sandstone. |
| |
Bhuban |
|
Hard compact sandstone,
olive shale, sandy shale and siltstone repetitions |
|
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