EGU24-248, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-248
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Long-term palaeoecological trends of the Late Cretaceous bivalves from Ariyalur, India

Arkaprava Mukhopadhyay, Shubhabrata Paul, Arghya Poddar, Debarati Chattopadhyay, and Ranita Saha
Arkaprava Mukhopadhyay et al.
  • Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, India

The present study aims to investigate the change in the bivalve community in the Late Cretaceous of the Ariyalur Sub-basin, south India, along with the changing sea level, depositional sequence, and lithology. A drop in bivalve diversity was recognized from the siliciclastic facies of the Coniacian-Santonian to the carbonate facies of the Maastrichtian. Two-way cluster analysis identified five distinct bio-assemblages and a prominent shift in the dominant ecological guild. The Coniacian–Santonian assemblages are dominated by infaunal taxa that changed into epifaunal-dominated Maastrichtian assemblages. Although the effect of secondary diagenetic alteration might have played a role, non-metric multidimensional studies suggest that other factors, especially the change in substrate condition and corresponding adaptive strategies employed by different functional groups of bivalves, may potentially explain the shift in community structure across the studied interval.

How to cite: Mukhopadhyay, A., Paul, S., Poddar, A., Chattopadhyay, D., and Saha, R.: Long-term palaeoecological trends of the Late Cretaceous bivalves from Ariyalur, India, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-248, https://doi.org/10.5194/egusphere-egu24-248, 2024.