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H. N. Bhattacharya ¹, G. Mukhopadhyay ², Pradip K. Bose ³

Affiliations
1 Department of Geology, Durgapur Govt. College, Durgapur 713 214, West Bengal, IN
2 Geological Survey of India, Calcutta, IN
3 Department of Geological Sciences, Jadavpur University, Calcutta 700032, IN

Abstract

Storm products are exceedingly rare in glacio-marine and -Iacustrine sequences. However, glacigenic Permo-Carboniferous Talchir sequence in Dudhi nala, West Bokaro coal basin, Bihar, registers two distinct hummocky cross-stratified facies units of considerable thickness. This, in turn, suggests the activity of storm waves vis-a-vis the removal of iceberg cover and considerable amelioration of climate during Talchir times.

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Subir Sarkar ¹, Partha P. Chakraborty ¹, Pradip K. Bose ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta-700 032, IN

Abstract

Breccia and pebbly massflow products are present in abundance in basin slope deposits of an unnamed marine Proterozoic fonnation in Maharashtra. Seven distinctive genetic modes have been identified and attributed to slump, slide, spring sapping and evaporite dissolution. The clasts are tabular in form and intraclastic in origin. The observations suggest caution against the prevailing tendency to equate occurrence of tabular intraclasts with shallow depositional regime. In order to ascertain their sedimentological significance, a clear understanding of their genetic processes is thus warranted.

Keywords

Sedimentary Structures, Carbonates, Proterozoic, Sedimentology, Maharashtra.

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