Stone tools have been discovered from Chota Nagpur plateau region which is from Mesolithic and Neolithic period. There are ancient cave paintings in Isko, Hazaribagh district which are from Meso-chalcolithic period (9,000-5,000 BC). In Kabra-Kala mound at the confluence of Son and North Koel rivers in Palamu district various antiquities and art objects have found which are from Neolithic to the medieval period and the pot-sherds of Redware, black and red ware, black ware, black slipped ware and NBP ware are from Chalcolithic to the late medieval period. Several iron slags, microliths, and potsherds have been discovered from Singhbhum district which are from 1400 BCE according to carbon dating age.