Journal Title
Title of Journal: J Earth Syst Sci
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Abbravation: Journal of Earth System Science
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Authors: Bhawanisingh G Desai Rajendra Dutt Saklani
Publish Date: 2014/08/30
Volume: 123, Issue: 6, Pages: 1413-1431
Abstract
The shallow marine sedimentary sequence of the Jaisalmer Basin exhibits one of the important and welldeveloped Tithonian sedimentary outcrops for western India The ichnology and ichnofabric of the lower part of Bhadasar Formation ie Kolar Dongar Member belonging to Tithonian age are presented and discussed The Kolar Dongar Member represents a shallow marine succession that contains 16 ichnotaxa Ancorichnus ancorichnus Conichnus conicus Gyrochorte comosa cf Jamesonichnites heinbergi Imponoglyphus kevadiensis Laevicyclus mongraensis Monocraterion tentaculatum Ophiomorpha nodosa Palaeophycus tubularis P bolbiterminus Phycodes palmatus Planolites beverleyensis Rhizocorallium isp Rosselia rotatus R socialis and Teichichnus rectus The ichnofabric analysis divulges five distinct ichnofabrics each typifying distinct depositional environment within shallow marine conditions The ichnofabric Ophiomorpha 1 with synsedimentary faulting exemplifies high energy conditions typical of lower shoreface environment whereas the Ophiomorpha 2 ichnofabric typifies upper shoreface environment The Ancorichnus ichnofabric reflects lower offshore condition of deposition The high ichnodiversity Ancorichnus–Rosselia ichnofabric is indicative of inner shelf conditions while low ichnodiversity Teichichnus ichnofabric indicates prevalence of low energy brackish bay environment Thus Tithonian Kolar Dongar Member indicates depositional environment ranging from shoreface to offshore to inner shelf and finally to brackish bay environment
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