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      https://www.ias.ac.in/article/fulltext/jess/127/08/0109

    • Keywords

       

      Nodular Limestone Formation; ammonoids; inoceramid bivalves; Turonian; Narmada Basin.

    • Abstract

       

      The age of the marine Nodular Limestone Formation of the Bagh Group is refined at Substage level through ammonoid and inoceramid index taxa. The study is based on the fresh collections from three well-defined successive intervals (Lower Karondia, Upper Karondia and Chirakhan members) of this formation having excellent exposures in different localities of the Narmada Basin, central India. The first record of the widely distributed Turonian ammonoid genera Spathites Kummel and Decker and Collignoniceras Breistroffer from the Nodular Limestone Formation constrained its age exclusively to Turonian. The Early Turonian species Spathites (Jeanrogericeras) aff. revelieranus (Courtiller) and Mytiloides labiatus (Sclotheim) occur in the lower part, while the Middle Turonian marker Collignoniceras cf. carolinum(d’Obrbigny) and Inoceramus hobetsensis (Nagao and Matsumoto) occurs in the upper part of the Karondia Member. The record of the index species Inoceramus teshioensis (Nagao and Matsumoto) in association with Placenticeras mintoi Vredenburg from Chirakhan Member allows a definite Late Turonian age. The present contribution is an attempt to resolve the controversies in the age of the Nodular Limestone Formation and also demarcation of the three divisions (Early, Middle and Late) of the Turonian Stage in the Narmada Basin, central India.

    • Author Affiliations

       

      Susheel Kumar1 Deo Brat Pathak1 Bindhyachal Pandey1 Anand Kumar Jaitly1 Jai Prakash Gautam1

      1. Department of Geology, Stratigraphy and Invertebrate Palaeontology Laboratory, Center of Advanced Study, Banaras Hindu University, Varanasi 221 005, India.
    • Dates

       
  • Journal of Earth System Science | News

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