To begin with the Palaeolithic Age was also called the old stone age covered the long period from the time the first ancestors of modern human beings started living in the Indian subcontinent from roughly 3 lakh B.C to 8000 or eighth millennium B.C.Archeologists divide it into three phases -the Lower or Early, the middle and the upper Palaeolithic age-according to the nature of the stone tools used by the people.
Then came the Mesolithic age also known as the late Stone Age which broadly covered the period from the eighth to fourth millennium BC.It is the intermediate or transitional stage between the Palaeolithic and Neolithic age. The tools of this age are called microliths. Neolithic Age: Third is the Neolithic age or the new Stone Age that covered the period roughly from 4000 to 1800 BC and was marked by the use of polished stone tools. Chalcolithic Age: Stone-copper age covered the period from 1800 to