Geological Survey of India (GSI) , established in 1851, is a premier earth science organization in the country. Headquartered in Kolkata , it employs over 2 0 00 profess ional geoscientists in its offices equipped with modern laboratory facilities over the entire length and breadth of the country. In its 162 years of distinguished existence, Geological Survey of India has made significant contribution to nation - building b y providing basic earth science information to the government, to the industry, and to the public.
