Acknowledgements We express our gratitude to Dr. (Mrs.) Vandana Prasad, Director, BSIP, for providing official permission to publish (vide: BSIP/RDCC/Publication no.23/2019-2020) and necessary facilities to carry out this work. PSR and MS acknowledge the in-house Project-8 of Birbal Sahni Institute of Palaeosciences, Lucknow, Uttar Pradesh, India.Peer reviewedPostprin