Abstract
The study of lithological associations, sedimentary structures and their interrelation suggests that the Talchir rocks of the Sahajuri Gondwana basin were deposited in a proglacial lake. The lowermost lithological association of diamictites and chaotic boulder beds deposited mainly as sediment gravity flows, represent a transitional phase between terminoglacial and proglacial sub-environments. The coarsening-upward sequence, coarse steeply dipping sandstone and fining-upward sequence together represent bottomset, foreset and topset, respectively, of a Gilbert-type delta. The delta progradation to the southwest was mainly controlled by decaying of buried ice in the lake floor and consequent enlargement of the lake. The diamictites were emplaced mainly as debris flow and the chaotic boulder bed by downslope slumping.
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