On the occurrence of ichnogenera Planolites  and Psilonichnus from the Jogira Formation (Lower  to Middle Eocene), Bikaner Basin, Western India:  Implications on depositional environment

Shyam Narayan Mude; Ravindrasing Pardeshi; Manoj Memane

doi:10.51710/jias.v38i1.186

Authors

Shyam Narayan Mude Associate Professor
Ravindrasing Pardeshi
Manoj Memane

DOI:

https://doi.org/10.51710/jias.v38i1.186

Abstract

Abstract: The Cenozoic sediments of the Bikaner basin are lithostratigraphically classified into four formations in ascending order of deposition viz., Palana Formation, Marh Formation, Jogira Formation and Kolayat Formation. The present paper records ichnofossils viz., Planolites montanus, P. beverleyensis and Psilonichnus isp from Jogira Formation (Lower Middle Eocene) of Bikaner basin, Western India. The presence of these ichnofossils in a succession exposed in a quarry SE of Jogira Lake plays a significant role in deciphering the depositional environment of Jogira Formation. In the present section two ichnofossil horizons are marked, the lower horizon is dominated by Psilonichnus isp whereas upper horizon is conquered by Planolites montanus, and P. beverleyensis. The sedimentological characteristic features and associated ichnofossils from the studied succession infer that the deposition of the sediments of the Jogira Formation initiated with lagoonal to backshore environment with the formation of mudstone and sandy shale, later with rise in the bathymetry from onshore to shallow marine environment, fossiliferous limestones were formed.

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