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Authors
Affiliations
1 Geology and Palaeontology Group, Agharkar Research Institute, G. G. Agarkar Road, Pune-411004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 5 (2008), Pagination: 731-738
Abstract
An ichnoassemblage from the Fort Member, Jaisalmer Formation, occurring in a hill north of the city of Jaisalmer is described. It comprises Arenicolites tenuis isp. nov., Bichordites isp., Planolites isp., Rhizocoralliurn irregulare Mayer, Rhizocorallium jenense Zenker, Taenidium serpentinurn Heer and Thalassinoides isp. Overall paucity of repichnia in an ichnoassemblage vis-a-vis noticeable dominance of domichnia and fodinichnia implies abundance of detrital nutrients. Host rocks yielding this ichnoassemblage are current bedded calcarenite showing fine shell hash along current beds and clayey limestones with presence of small, lenticular storm bed intercalations. They suggest near-shore, moderate-to strong-energy marine conditions rich in organic nutrients, supporting inferences drawn on the basis of trace fossils. The beds containing this ichnoassemblage are assigned ages ranging from Bathonian to Callovian, and hence considered here Middle Jurassic.
Keywords
Trace Fossils, Fort Member, Middle Jurassic, Jaisalmer, Rajasthan.
