Abstract
A scale of confinement in the recent paralic environments of western Africa can be proposed based on the distribution of foraminiferal assemblages. It is thus possible to describe the gradual evolution from an oceanic environment, where marine species are dominant, to a continental environment characterized by the disappearance of foraminifers and the development of thecamoebians. The peculiar environments of athalassic salt lakes are not considered here. This scale, based on four characteristic assemblages and extended to 90 species can be applied to recent or fossil paralic ecosystems. However, it must be used with caution as its significance may change with hydrological properties.
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