Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Vishwas S. Kale ¹, Sheila Mishra ², Victor R. Baker ³

Affiliations
1 Department of Geography, University of Pune, Pune 411 007, IN
2 Department of Archaeology, Deccan College, Pune 411 006, IN
3 Department of Hydrology and Water Resources, University of Arizona, Tucson AZ 85721, US

Abstract

A continuous record of the largest Narmada floods over the last 2000 years was obtained from Sakarghat, on the Narmada River from a study of slackwater flood deposits. Two sequences of extreme floods date between ca. 400 and 1000 AD and post-1900 AD. The period, 400-1000 AD representing a period of less frequent but more extreme floods, has been documented in the archaeological record as one of decline of human settlements.

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Sheila Mishra ¹, Sushama Deo ¹, Sharad Narhar Rajaguru ¹

Affiliations
1 Department of Archaeology, Deccan College, Pune - 41 1 006, IN

Abstract

Earlier workers have classified the lateritized surfaces into two groups - one showing a conformable relationship and the other an unconformable relationship to the Deccan trap. The first surface occurs at elevations varying between 1200 to about 1500 m asl in the Sahyadri range on the youngest Deccan Trap flows, while the second is found at elevations varying from 10-200 m asl in the narrow coastal plain to the west of the Sahyadris on lower (older) Deccan Trap flows. Our observations of laterites in Pune, Raigarh and Satara and Sangli districts of Maharashtra within the Deccan Trap region however show that the geomorphology of laterites in relation to the Deccan Trap is more varied than indicated in the model by Widdowson. Two major denudational surfaces on the Deccan Trap, at 600 m asl and 850 m asl have preserved remnants of a laterite cover which have implications for the denudational history of the Deccan Traps.

Keywords

Laterite, Sahyadri, Palaeosurfaces, Lonavala, Matheran, Karha.

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