[25] A raised beach from the quaternary era

Flattened against a cliff of black shales, that unity of pebbles, cemented into a conglomerate through sand and iron oxide, corresponds to an ancient beach (from – 80 000 years ago to – 100 000 years ago).

Its position at a few metres above the level of the current highest seas attests the variations of the shore line during the Quaternary Era.

Its development took place during the Eemian inter-glacial Era (Riss-Würm) : climate warming for that period led to a partial thawing of the ice-cap and thus to a raising of the sea level.

This is one of the most beautiful raised beached of Brittany.