Abstract:
Talchir Formation (Permo-Carboniferous) basalmost unit of the Gondwana
Supergroup records the Late Paleozoic glaciation in Peninsular India. The Hasdeo
River section of the Talchir formation, Son valley basin signifies as a glacio-marine
depositional environment, yet it is not adequately studied and represented. It is
imperative to understand the cyclicity in term of glacial advancement and retreat
history of Talchir Formation in order to properly understand the evolutionary history of
Gondwana supergroup of Son valley basin.
Talchir sedimentary succession of the Hasdeo river section , Son Valley basin exhibits
thirteen facies types grouped under three facies associations, i.e., Reworked
Proglacial Facies Association(FA-I), Proximal Periglacial–Marine Facies
Association(FA-II), Distal Periglacial-Marine Facies Association (FA-III). Overall facies
architecture reflects a fining upward sequence which starts from ice-covered proglacial
sedimentation, which was reworked by marine influences and finally, overlain by shelfshore
marine sediments.
The depositional model indicates increasing marine influence in the sedimentation
pattern, which is evident from the vertical distribution of facies in the sedimentary
succession. Increasing marine influence over glacial sedimentation can be interpreted
as a result of either rising sea level or basinal subsidence from tectonic activities within
the basin
