Abstract
In Sepetiba bay (State of Rio de Janeiro), a semi-confined, 305 km2 salt-water body, the present sedimentation is essentially elastic. From these sedimentary deposits, 92 samples have been collected and analysed which have allowed us to investigate the following parameters: benthonic foraminifera / planktonic foraminifera ratios, physical conditions of the foraminifera (size, wall thickness and abrasion degree), and the diatom content of the samples. Six dominant species of foraminifera have been identified in the studied area: Ammonia beccarii Line in thirty-eight samples, Buliminella elegantissima Orbigny in seventeen samples, Textularia sp. in fourteen samples, Bulimina marginata Orbigny ii, two samples, Reophax sp. and Arenoparrella mexicana Kornfeld in one sample. Thus, three principal biofacies and three less important biofacies are characterized by foraminiferal content of the sediments. These results confirm the importance of foraminiferal synecological studies in understanding water circulation dynamics and sedimentary dispersion on a regional level. Moreover, it has been verified that the water-oxygen content of the ecosystem is reflected by the foraminiferal content of the sediments.
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