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<p>The late Eocene Kopili Formation was studied to deduce depositional environment from an 88&#xa0;m sedimentary succession in the Jaintia Hills, Meghalaya, India. The lithology comprises fissile shale, marl, and limestone beds in the lower part of the section, with abundant larger benthic foraminifera such as <i>Discocyclina</i> ssp., <i>Pellatispira</i> ssp., <i>Nummulites</i> sp., and <i>Operculina</i> sp., and planktic foraminifera such as <i>Hantkenina</i> sp., <i>Chiloguembelina</i> sp., and <i>Globigerina</i> sp. In contrast, various siliciclastic beds of shale, siltstone and sandstone alternate in the middle and upper parts of the succession. The mineralogical and geochemical proxies, such as QUARTZ<sub>pollycrytalline</sub>/(Feldsper + Rockfragments) vs. QUARTZ<sub>tota</sub><sub>l</sub> (Feldsper + Rockfragments), Sr/Cu, and C-values, indicate a warm, humid climate with an average temperature of 19.62&#xa0;°C ± 5&#xa0;°C, in accordance with the global late Eocene cooling trend. These data also reflect intermediate to intense weathering, confirming high precipitation, likely linked to the onset or strengthening of the South Asian Monsoon in the Indian subcontinent. The sedimentological, palaeontological, and geochemical analysis confirmed that the lower part of the Kopili Formation was deposited on the marine carbonate platform, while the upper part was formed in the transitional coastal environment.</p> Graphical abstract <p></p>

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Reconstruction of depositional environment from the Kopili Formation, East Jaintia Hills District, Meghalaya, India

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • T. Ngamlengin Haokip,
  • Urbashi Sarkar,
  • Arun Jyoti Nath,
  • M. Venkateshwarlu,
  • Jumee Dowari

摘要

The late Eocene Kopili Formation was studied to deduce depositional environment from an 88 m sedimentary succession in the Jaintia Hills, Meghalaya, India. The lithology comprises fissile shale, marl, and limestone beds in the lower part of the section, with abundant larger benthic foraminifera such as Discocyclina ssp., Pellatispira ssp., Nummulites sp., and Operculina sp., and planktic foraminifera such as Hantkenina sp., Chiloguembelina sp., and Globigerina sp. In contrast, various siliciclastic beds of shale, siltstone and sandstone alternate in the middle and upper parts of the succession. The mineralogical and geochemical proxies, such as QUARTZpollycrytalline/(Feldsper + Rockfragments) vs. QUARTZtotal (Feldsper + Rockfragments), Sr/Cu, and C-values, indicate a warm, humid climate with an average temperature of 19.62 °C ± 5 °C, in accordance with the global late Eocene cooling trend. These data also reflect intermediate to intense weathering, confirming high precipitation, likely linked to the onset or strengthening of the South Asian Monsoon in the Indian subcontinent. The sedimentological, palaeontological, and geochemical analysis confirmed that the lower part of the Kopili Formation was deposited on the marine carbonate platform, while the upper part was formed in the transitional coastal environment.

Graphical abstract