Ichnology of the Goradongar Formation,Goradongar hill range,Patcham island,Kachchh, Western India |
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| Authors: | Satish J Patel Jaquilin K Joseph Nishith Y Bhatt |
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| Institution: | 1. Department of Geology, The Maharaja Sayajirao University of Baroda, Vadodara, 390 002, India
2. Geology Department, M.G. Science Institute, Navrangpura, Ahmedabad, 390 009, India
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| Abstract: | The middle Jurassic Goradongar Formation exposed in Goradongar hill represents a mixed siliciclasticcarbonate succession with shales and limestones. They contain a large number of well preserved trace fossils. Total 44 ichnospecies of 31 ichnogenera; representing diverse ethology, were grouped in five ichnoassemblages (Planolites, Palaeophycus, Gyrochorte, Rhizocorallium and Arenicolites assemblage). These recurring ichnoassemblages represent the Cruziana ichnofacies and occasionally a mixed Skolithos-Cruziana ichnofacies. Patterns of diversity and density of the trace fossils reveal changes in bathymetry, oxygen level, trophic level and the sub-strate conditions at the time of deposition. These paleoenvironment and palaeo-oceanography changes are co-relatable to world-wide Bathonian-Callovian (middle Jurassic) deposits. |
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