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Dr. M. Ramakrishnan is an outstanding Precambrian Geologist who has specialized in the geology of southern India.  He was born at Madurai in 1940.  he did M.Sc from the Presidency College, Chennai and obtained Ph.D. from the Indian Institute of Science, Bangalore.  He retired as Senior Deputy Directory-General of the Geological Survey of India.  He also headed the Centre for the Earth Science Studies, Thiruvananthapuram.  He served as Scientific Board Member of the International Geological Correlation Programme (IGCP) of the UNESCO, Paris, and several committees of the Department of Science and Technology, Government of India.  He was associated with many geoscientific organizations and universities.  He served the Geological Society of India in various capacities including the Editor and Vice President under his mentor Dr. B.P. Radhakrishna.  He was awarded the National Mineral Award and the Mysore Geologists' Gold Medal that was the forrunner of the prestigious Bellur Rama Rao Award of the Geological Society of India.  Field geology was his forte as evidenced from his extensively cited publications on Dharwar and Chhattisgarh geology, Eastern Ghats and Pandyan mobile belts and 'Purana' basins.  M.N. Viswanatha, J. Swami Nath and B. Chadwick were his main field companions.  He has participated in numerous field geological excursions in India and abroad.  He has traveled widely and has worked in the classical high-grade terrain of West Greenland with Prof. B. Chadwick of Exeter University, U.K.  he has collaborated with well-known Precambrian geologists like S. Moorbath, B.F. Windley, A. Kroner, A. Nutman and B.P. Radhakrishna.  He is the compiler of several thematic geological maps and has written and edited valuable books on regional geology.