A NEW TYPE OF LACUSTRINE ICHNOFOSSILS FROM THE LOWER JURASSIC ZILIUJING FORMATION IN WANZHOU OF CHONGQING AND ITS PALEOENVIRONMENTAL SIGNIFICANCES
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Abstract:
The Early Jurassic trace fossil is reported for the first time from the Da’nanzhai Member of the Lower Jurassic Ziliujing Formation in Tiefeng Mountain of Wanzhou,Chongqing.The newlyfound trace fossil is attributed to a new ichnospecies-Palaeophycus tiefengshanensis, which differs from other ichnospecies of Palaeophycus by its large size and nodular surface.Ichnofabric analysis shows that the bedding-plane bioturbation indice of the Palaeophycus ichnofabric is 5 representing the highest level of bioturtation,which suggests abundant food supply,high level of oxygen content and frequent animal activities.Based on the sedimentary facies changes of the Tiefengxiang section,the eastern region of Sichuan Basin experienced a similar environmental transformation of lake regression as the northern region of Sichuan Basin;the differences are the locally more habitable environment for ichnofauna in the studied area.
