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Mukhopadhyay, G.
- Hummocky Cross-Stratification and its Hydraulic and Climatic Implications in Talchir formation, Dudhi Nala, Hazaribagh, Bihar
Authors
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
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 4 (1989), Pagination: 398-404Abstract
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.
- Stratigraphic Correlation Between Different Gondwana Basins of India
Authors
1 Geological Survey of India, Coal Wing, DK-6, Sector-II, Salt Lake, Kolkata - 700 091, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 3 (2010), Pagination: 251-266Abstract
Gondwana Basins of India occur within the suture zones of Precambrian cratonic blocks of Peninsular India along some linear belts. More than 99% of the total coal resource of the country is present within these basins. The basins are demarcated by boundary faults having graben or half-graben geometry.
These basins preserve a thick sedimentary pile deposited over nearly 200 million years from latest Carboniferous to Lower Cretaceous. However, due to lack of well-constrained data, age of most of the formations is assigned tentatively. This has resulted in diversified views on both intra- and inter-basinal stratigraphic correlation particularly in case of Upper Gondwana formations.
It is well recognised that there are distinct spatial and temporal similarities in lithological, faunal and floral distribution in different Gondwana Basins of southern continents, including India, that were once part of supercontinent Gondwanaland. To address the problems of Indian Gondwana stratigraphy, during the present study, some unique events, also recognised in other parts of Gondwanaland, like marine flooding surfaces, large scale tectonic events or major change in depositional environment have been used as a tool for temporal correlation within the Gondwana Basins of India. Many of these events have been dated from different basins elsewhere. Considering these major events as time planes the total time span of deposition in Gondwana Basins has been classified into seven time slots. Recognition of these time planes helps in interbasinal correlation of different formations in Indian Gondwana basins and assigning the age, wherever available. This approach also helps in better understanding of basinal history. Unless otherwise mentioned, the time scale proposed by International Commission on Stratigraphy (2004) has been followed in this paper.