Professor P. K. Kathal, former Head, Department of Applied Geology, Director, Centre of Advanced Study in Geology, and Dean, Research and Development, Dr. Harisingh Gour Central University at Sagar is engaged in teaching and research in the field of Micropaleontology since 1982. He is a working Member, IGCP Program (UNESCO) up to 2016. A recipient of the International Research Fellowships awarded by the Japanese Society of Promotion of Research (JSPS) in 1999 and also in 2003 to work in Akita University and Kumamoto University, Japan, respectively and DGF Fellowship (Germany) in 2007 to work in Tuebingen University, Germany Prof. Kathal has chaired sessions in international events including ISEM, Canada and Austria besides contributing more than 60 research papers in international and national journals.  The present book is an effort to commensurate the widening gap in the research and text in the last 15 years since he contributed 'Microfossils and their applications' in 1998.