CONTRIBUTION OF MARINE GEOLOGY TO DETERMINE THE SOURCE OF PALAEOLITHIC RAW MATERIALS IN THE ARMORICAN MASSIF: POSSIBLE ORIGIN OF FLINT USED AT MENEZ-DREGAN LOWER PALAEOLITHIC STATIONS (PLOUHINEC, FINISTERE, FRANCE). PALEOCLIMATIC AND PALEOENVIRONMENT

摘要

There is no flint in the armorican terrain. Its use during Palaeolithic is mainly dependent from the gathering of marine pebbles taken along the old shorelines located at different levels. However, at Menel.-Dreganl layer 5d', flint flakes do not show the cortex aspect which witness fora long transport. Analysis of dredging and coring samples made off Baie d 'Audierne shows that, part of the raw material used to make the tools from Menez-Dregan 1 layer 5d' may come from an old shore located at about -40 m depth and at a distance of 5 to 10 km from the actual coast, which developed during a marine regression phase associated with the beginning of a climatic deterioration. These results are in strong concordance with those of paleobotany (anthracology). They provide paleo-geographic and paleoenvironmental informations for a better knowledge of the Palaeolithic presence in Western Brittany.