A Volcanic Ash-Fall at the Early/Mid Weichselian-Würmian Transition in the Bog of the Grande Pile (Vosges, France)

Etienne Juvigné & Niels-Axel Mörner
A continuous core of lacustrine sediments from the well-known Grande Pile locality in northeastern France was analysed. We report here on a new ash bed, the "diopside ash-fall"; its stratigraphic position at the Early/Mid-Weichselian-Würmian transition is quite firm. At present, radiometric dating does not not permit more precise dating of this ash bed than between 53,000—62,000 B.P. In total 5 ash beds have been reported from the peat bog of Grande Pile.