Age

Formation

Lithology

Recent

Alluvium; sand, silt and clay of older alluvium, younger flood plain deposits, channel fills etc.

Sub-Recent

Laterites/recent gravel and conglomerate beds.

Up. Permian to

Lower Triassic

Kamthi (Upper) = Raniganj

Conglomerates, pebbly and ferruginous sandstones and red shales.

Kamthi (Lower) = Barren measures

Gray shales, carbonaceous shales, sandstone, clay and iron stone nodules.

Lower Permian

Barakar

Gray sandstone, carbonaceous Shale, silt stone with thick coal seams and fire clay.

Karharbari

Black carbonaceous sandstone, pebble bed, coal seams.

Talchir

Dimictite, greenish sand stone, olive and chocolate shales, rhythmites.

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--Unconformity--------------------------------

Precambrian

Granite gneisses, amphibolites, migmatites etc.