The present book 'Prehistoric Odisha' with special reference to Somakoi Basin" is primarily based on an archaeologiocal survey of the Somakoi basin which spreads over the districts of Keonjhar and Anugul in North Odisha.It is delineating with Prehistoric cultures and historical period. The present work is based on the primary data collected by the author.The Trial excavation also provided cultural succession of mesolithic and neolithic culture of the area. In additon to the stone tools of prehistoric cultures,The historical period is also added significant parameter in the form of ceramics assemblages etc. The area was Not given proper attention by the Pre -historian and archaeologist prior To the present work. The detailed morphological and typological studies of the stone tolls are duly illustrated through tables, line drawing and charts.