1. Department of Earth and Environmental Sciences, Indian Institute of Science, Education and Research Mohali, Punjab-140306, India
2. Centre of Advanced Study, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, India
3. Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
4. Department of Botany, Sidho-Kanho-Birsha University, Ranchi Road, Purulia-723104, India
5. Geological Studies Unit, Indian Statistical Institute; 203, B.T. Road, Kolkata-700108, India