Abstract
Dinoflagellate cysts of Paleogene in North-Western Europe have been studied in terms of relationships between assemblages fluctuations and confinement factors in each basin. Thus in Paris Basin paleogeographical changes are well marked by quantitative variations of dinocysts associations. The confinement is in particular characterized by a strong decreasing of dinocysts content, decrescent from 180 to about 10 species or even less. Within such poor associations qualitative components vary in response to facies and environmental conditions particularly those correlated to confined areas. The same studies were carried out in the Hampshire Basin. The quite different data are interpreted as a result of differences between sedimentological patterns of the Hampshire and Paris Basins.
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