The Paleolithic period of Brittany ranges from 700 000 to 10 000 years BC. Traces of the oldest industries were found in the middle valley of the Vilaine river, identified as pebbles arranged in a quarry in Saint-Malo-de-Phily. The oldest traces of habitat are located in Saint-Colomban, in Carnac, and take the form of settlements built in natural shelters (cliffs created by the erosion along the coasts). In addition to pebble, bifaces are found there, and the site dates to 300,000 BC. J.-C. Acheulian bifacials from this period are found along the sea coast, as Treguennec, Hôpital-Camfrout or Pléneuf. The oldest traces of fire use (in the region but also of occidental Europe) are found on the site of Menez Dregan with a date making them up to 400 000 years BC. The few human groups are then made of hunter-gatherers.