What is prehistoric age?

The earliest relics of man's existence in Europe are roughly chipped implements and weapons of flint and stone, of horn and bone, the latter frequently resembling those used by the modern Esquimaux and the former similar to those still used by absolutely savage races. Of a later date are other stone implements carefully finished and polished. There is a gap, or "hiatus," between the age of rough stone implements, the Paleolithic time, and the " age of polished stone" the Neolithic time.* The highly vigorous drawings of animals on bone or ivory which belong to the Paleolithic age are not found in the later age of polished stone.