the clactonian and acheulean industries might have existed at the same time. however, in 2004, archaeologists excavated a butchered pleistocene elephant near dartford, kent. they found many clactonian flint tools, but no hand axes. since hand axes would have been more useful than choppers to dismember an elephant carcass, this is evidence that the clactonian was a separate industry. flint of sufficient quality was available in the area, so archaeologists think the people who carved up the elephant did not know how to make hand axes.