Abstract

(Le Mesnil sous Jumièges , Seine-Maritime, France). The Funicular cave is a major cave of the Lower Seine. Completely exca¬ vated 40 years ago by its owner , it presents a spatial organization model of drains for the paleokarsts of the great valley. Among the infillings, we discovered a brown-black deposit with a surprising concentration of 90 % iron and of 7 % manganese , without organic matter or nickel mineral.

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