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      https://www.ias.ac.in/article/fulltext/jess/128/08/0222

    • Keywords

       

      Lower Vindhyan; Upper Vindhyan; unconformable boundary; transgressive lag; persistent sandstone horizon; subtidal deposit

    • Abstract

       

      The placement of the boundary between the Lower and the Upper Vindhyan in the Son valley, an unconformity, has long been at the centre of a raging debate. At the Bundelkhand sector, it is placedbetween the Rohtas Limestone and the Sasaram Sandstone (Lower Quartzite). On the other hand, in the Son valley sector, it is placed between the Bhagwar Shale and the Kaimur Formation. The recent study reveals the existence of ca. 12 m thick sandstone between the Bhagwar Shale and Rohtas Limestone, traced over 150 km in the Son valley sector. Based on in-depth facies constituents and facies tracts, this sandstone is an exact equivalent of the Sasaram Sandstone in the Bundelkhand sector. Its base is strongly erosional and limestone and chert clasts derived from the underlying Rohtas Limestone are abundantly present at the basal part of the sandstone and the unconformity between the Upper and Lower Vindhyan are likely to be present in between.

    • Author Affiliations

       

      SABYASACHI MANDAL1 ADRITA CHOUDHURI2 INDRANI MONDAL1 SUBIR SARKAR1 PARTHA PRATIM CHAKRABORTY3 SANTANU BANERJEE4

      1. Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India.
      2. Department of Earth Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, West Bengal 741 246, India.
      3. Department of Geology, University of Delhi, New Delhi 110 007, India.
      4. Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, India.
    • Dates

       
  • Journal of Earth System Science | News

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