Ichnofossils from the Neogene and Quaternary Deposits of Dwarka-Okha Area, Jamnagar District, Gujarat

A rich and diversified ichnofossil assemblage compnsing seventeen ichnospecres distributed among ten ichnogenera have been discovered for the first time from Neogene-Quaternary deposits of Dwarka-Okha area, Jamnagar district Gujarat, India The ichnospecies are Cyllindrichnus (Howard), Keckia annulala Glocker, Laevicyclus mongraensis Verma, Ophiomorpha borneenszs Keij, 0 irregulazre Frey, Howard and Pryor, 0 nodosa Lundgren, Palaeophycus heberti (Saporta), P tubularis Hall, Planolites annularis Walcott? P beverleyeasis( Billings)P, montanus Richter, Psilonichnus upsilon Frey, Curran and Pemberton, Rhizocorallium karatensis Chplonkar and Ghare, R yelamensis Sanganwar and Kundal, Skolithos ichnospecies Thalassinoides paradoxicus Woodward and T suevzcus Rieth Of these three species, namely Cylindrichnus concentrichus, Ophiomorpha borneensis and 0 lrregulatre Frey, Howard and Pryor are being reported for the first time from India Barring Ranjitpur Limestone Member of Gaj Formation and Aramda Reef Member of Chaya Formation, the rocks of all other members have yielded ichnofossils Present paper provides systematic description of aforementioned seventeen ichnospecies and analyses them for depositional environments The present ichnocoenose defines Skolthos-Cruziana mixed ichnofacies that lndicates httoral to shallow sublittoral sandy shore with very high energy conditions of deposition.