• Revision of Cassiduloid genusGongrochanus Kier (Echinodermata: Echinoidea) from South Indian Cretaceous deposits

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      https://www.ias.ac.in/article/fulltext/anml/092/03/0231-0246

    • Keywords

       

      Gongrochanus ; Cassiduloid; geological range; Maestrichtian; Cretaceous deposits; Echinoidea

    • Abstract

       

      Revision of the genusGongrochanus Kier from Upper Cretaceous beds of South India has revealed the presence of seven species including its type speciesG. herschelianus (M’Clelland). On the basis of phyllode characters the species have been divided into two informal groups. A biometrical analysis by applying the Bartlett’s andF-test proves the validity of the species described. Coefficients of correlation and regression computed for parameters of length, width and height forG. herschelianus are dependent upon one another; that change of length versus width is more regular than that of length versus height. Occurrence of this genus inHauriceras rembda zone andPachydiscus otacodensis zone of Kallankurichchi and Ottakkovil formations respectively of Ariyalur Group helps in rectifying its geological age which now can be taken as extending from Lower Maestrichtian to Middle Maestrichtian instead of Senonian.

    • Author Affiliations

       

      R M Badve1 S A Aziz1

      1. Department of Geology and Palaeontology, Maharashtra Association for the Cultivation of Science, Research Institute, Pune - 411 004, India
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