Abstract
Three new Lateglacial molluscan successions from the Oise and the Seine valleys are reported and compared with the Somme valley references (Limondin, 199S). Malacological data from northern France and southeastern England Lateglacial sequences show close affinities. The early Lateglacial deposits yield impoverished faunas with abundant Valloma. The Alleröd appears to be a very stable episode with richer and more diverse assemblages. Occurrences of some xerophilous taxa, particularly Heltcopsis striata and Trochoidea geyeri, are typical of this period. The Younger Dryas cold period is marked by a decrease in the abundance of molluscs and the development of some hygrophilous cold- resistant taxa (Trichia hispida, Succwea oblonga, Columella columella). Consistency of malacological successions over a large area demonstrates that this material can be used for Lateglacial chrono-climatic characterization. This is specially important for a period mainly represented by calcareous deposits leading to the loss of all organic fossils except molluscs.
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