The Middle Stone Age or mesolithic people hunted game, fished in the rivers and sea and gathered plants and berries for food. They left few marks on the landscape even though they lived throughout the area stretching from the Vale of Pickering to the tops of the moors. The evidence for their presence exists in the flint tools found lying on the moors. These originate from below the peat which formed later as the forest was destroyed. A variety of tools are found : arrowheads, axe heads, spear points, side & end scrapers and blades.