Table 1 Identified lithofacies from the outcrop sections at Risang waterfall, Risang-Thakurchara, Alutila cave and Army camp, Dhoilachara-Bangmara, and Matiranga-Alutila Road Cut sections.
Facies association | Facies code | Facies types (cumulative) |
|---|---|---|
A1 | A1a | Herringbone, hummocky, trough cross-bedding followed by heterolithic bed |
A1b | Parallel laminated bed, cross-bedded sandstone, heterolithic bed, and sand-shale alteration | |
A2 | A2a | Claystone, parallel laminated bed, and sandstone with clay lenses |
A2b | Ex-situ Conglomerate | |
A2c | Claystone, lenticular bed followed by sandstone with clay streak | |
A2d | Repetitive feature of flaser, lenticular, and wavy bedding | |
A2e | Shale with silt followed by minor pieces of conglomerate | |
A2f | Claystone and lenticular bed with occasional exfoliated shale | |
A2g | Flaser, wavy, lenticular bed with a yellowish sandy streak | |
A3 | A3a | Flaser, lenticular, wavy bedding followed by massive sandstone, trough cross-bedding, parallel laminated bed |
A3b | Sand injected into the clay with overlain load cast followed by occasional lenticular bed | |
A4 | A4a | Claystone, lenticular, and calcareous band with occasional shale |
A4b | Siltstone, nodular shale, calcareous band underlain over a massive sandstone | |
A4c | Repetitive sand-shale alteration with in-situ para-conglomerate and concretions | |
A4d | Claystone and siltstone overlay on a massive sandstone | |
A4e | Fissile shale | |
A4f. | Paper-thin laminated shale | |
A4g | Pro-deltaic shale with frequent lenticular bed | |
A4h | Marine shale | |
A4i | Yellowish brown massive sandstone | |
A5 | A5a | Graded bedding followed by flaser and lenticular |
A5b | Heterolithic bed with clay | |
A5c | Shale with a silty streak | |
A5d | Trough cross-bedded with parallel laminated bed and massive sandstone |
