Le 30 septembre 2018
Balades en kayak et à pieds au départ de Grand Méjean, à la découverte des criques à l’eau translucide blotties sous les falaises de marnes ou de calcaire. La géologie de la côte bleue atteint ici sa plus grande variété : on passe en quelques centaines de mètres, de la calanque des eaux salées au cap Méjean, du conglomérat aux marnes puis au grès et enfin au calcaire, le tout étant souvent mélangé et enrichi d’inclusions d’aragonite, avec donc au final un très beau et rare florilège de formes et de couleurs, blanc du poudingue, traits oranges dans le gris des marnes, grès orange strié de lignes parallèles, et enfin calcaire blanc creusé de grottes au rocher multicolore.
On découvrira ce jour une jolie crique sous les falaises de marnes, où une infiltration d’eau dans les fissures de grès alimente une cascatelle et des calcifications multicolores (méduse et colonnettes) plaquées sur les marnes, encore une curiosité géologique sur une côte qui n’en manque pas ! On explorera ensuite une grotte suspendue au-dessus de la mer proche du Cap Méjean, en fait un système de salles reliées par des corridors avec pas moins de 4 fenêtres naturelles ouvertes vers le large.
la crique atteinte en kayak...
... et ses formations de calcite et de marnes multicolores
la côte juste à l'ouest, ses vagues de marnes
la côte juste à l'est, son marne strié...
... et ses inclusions cristallines
vers le Cap Méjean...
... une grotte et son système de fenêtres au-dessus de la mer
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