A long Upper Pleistocene pollen record from Les Echets, near Lyon, France
Identifieur interne : 001A07 ( Main/Curation ); précédent : 001A06; suivant : 001A08A long Upper Pleistocene pollen record from Les Echets, near Lyon, France
Auteurs : Jacques-Louis De Beaulieu [France] ; Maurice Reille [France]Source :
- Boreas [ 0300-9483 ] ; 1984-06.
Abstract
Analysis of 732 samples through 39 m of sediments from the ancient lake of Les Echets, 15 km northeast of Lyon, France, resulted in a long, continuous pollen diagram covering the interval from the Late Rissian to the Holocene. Above a complete Ecmian sequence, there are two Early Wiirmian temperate cycles (the older one including two climatic optima separated by a brief deterioration) with forest successions characterized by the spread of Carpinus at the end of the early temperate phase. These episodes, whose exact equivalents are found at Grande Pile in the Vosges area, are correlated with the Early Wiirmian trilogy Amersfoort‐Brorup‐Odderade of northern Europe. The absolute dates proposed for the Grande Pile sequence arc accepted, whereas those for the three northern European stratotypes are rejected. The Early Wiirmian is thus placed between 115,000 and 70,000 years B.P. In the Middle Wiirm, three undated intcrstadials arc characterized by a sparse forest cover. The long Late Wiirmian section is a characteristic feature of the sediment history at Les Echets. Very cold and arid conditions prevailed during this interval, without any unequivocal indications of intcrstadial episodes. A rise in Artemisia around 15,000 B.P. marks the transition from the Pleniglacial to the Oldest Dryas.
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DOI: 10.1111/j.1502-3885.1984.tb00066.x
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