Late Paleolithic, from 40th millennium BC Aterian tool-making[2] Semi-permanent dwellings in Wadi Halfa[2] Tools made from animal bones, hematite, and other stones[2] Neolithic, from 11th millennium BC c. 10,500 BC: Wild grain harvesting along the Nile, grain-grinding culture creates world's earliest stone sickle blades[2] roughly at end of Pleistocene c. 8000 BC: Migration of peoples to the Nile, developing a more centralized society and settled agricultural economy c.