The book is based on intensive and extensive field explorations conducted by late Dr. Shiba Charan Nanda in the Indravati basin of the undivided Koraput district of Odisha. It is one of the first systematic attempts to understanding the Stone Age cultures of the Indravati river valley which brought to limelight a large number of Upper Palaeolithic and Mesolithic sites with a diverse range of archaeological records. The study of the stone artifacts with in-depth analysis of the typology and technology and comparison with other well-known sites of India provides a methodological framework for prehistoric investigations in regional context. The author has also taken into account of the settlement and subsistence patterns of the ethnic communities living in the landscape for ages for developing analogies for interpreting the prehistoric cultures from an ethno-archaeological point of view.