Abstract
Study of bedforms, facies and associated sedimentary structures in the Talchir rocks of Taratanr Lower Gondwana basin suggests that the basal Talchir Boulder bed was deposited by both ice (moraines and deltaic moraines) and braided streams of glacier derivation (outwash deposit). The overlying sandstone was deposited by ephemeral streams. Six depositional facies related to the bedforms, ripple, dune, bar, plane bed, transverse rib and current crescent, were identified. Data compared with those from modern environments, show excellent correlation with the features of modern glacial outwash plains and modern braided, high-gradient streams. A comparison of the stratigraphy and sedimentology of Talchir rocks from eight Lower Gondwana basins in eastern India suggests that the tentative basin model for Talchir deposition in the Taratanr basin may serve as a basic model for Talchir sedimentation in all the Lower Gondwana basins in eastern India.
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