Flint was formed over 100 million years ago from chalk deposits in dried sea beds containing microscopic and larger sea creatures. Flint is very strong and sharp, making it useful for tools. Early humans began using flint tools during the Palaeolithic period 600,000 years ago, knapping flint into hand axes, borers, choppers, and scrapers. During the later Mesolithic period, smaller microlith tools were used for arrowheads, woodworking, and hide working. Flint tool use continued into the Neolithic and Bronze Ages, where axes, arrowheads, and scrapers took on new shapes and styles. The discarded remains of flint tool production provide important clues about past human behaviors and landscapes