This work is granted by the BSIP Lucknow,India in the form of an In-house Project No.3(2021-2025).The authors would like to thank the Director(BSIP)for providing the necessary infrastructure and permission(s)to publish the present investigation.AC is indebted to the authorities of BSIP for a Birbal Sahni Research Associateship.Technical support provided by Subodh Kumar(FESEM facility,BSIP)and Amritpal Singh Chaddha(Geochemistry Laboratory,BSIP)during SEM,EDS,and XRD analyses is thankfully acknowledged.Abhishek R.Lakhote(Dept of Earth and Environmental Science,KSKV Kachchh University,India)is acknowledged for his help during constructing one illustration.VVK acknowledges Matú? Hy?ny(Dept of Geology and Palaeontology,Comenius University,Bratislava,Slovakia)for his input on earlier version(s)of the manuscript and Moriaki Yasuhara(School of Biological Sciences and Swire Institute of Marine Science,The University of Hong Kong,Hong Kong SAR,China)for his valuable opinion on ostracods.The authors also thank the AGS Editor-in-Chief(Hou Zengqian),Deputy Editor-in-Chief(Fei Hongcai),Carrie E.Schweitzer(Department of Geology,Kent State University,USA)and Susan Turner(Brisbane)for their constructive comments and assistance with English. （2021-2025）