Abstract
The distribution of rudists, hermatypic Scleractinia and the larger Foraminifera indicates that the approximate position of the North Temperate/Tethyan (Mesogean) Realm boundary in western France lay, during the Cenomanian, in the Poitou region. The Paris Basin lay to the north of this boundary whilst the Aquitaine Basin lay to the south. The faunal contrasts between these two areas have hindered biostratigraphic correlation across the Realm Boundary and have resulted in uncertainty concerning the relationship between the tripartite division of the Stage in Sarthe (the type area) and northern Aquitaine. Progress in correlation between the two Basins is reviewed and refined in the light of recent evidence. Large-scale (tens of metres) cyclicity associated with hardground development is described by the Paris and Aquitaine Basins and the existing biostratigraphy is shown to allow the correlation of major hardground horizons across the Realm boundary. Eustacy is postulated as the control mechanism responsible for the observed synchronicity of these levels of penecontemporaneous cementation.
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