In this study we examine the nature of microforaminifera test linings found in palynological preparations and demonstrate the potential of these palynomorphs for paleoenvironmental interpretation. Sediment samples from four marsh salinity zones of the Barataria Basin, Mississippi Delta, were processed by conventional palynological techniques which included HCl and acetolysis treatments. Taxonomic identification was not attempted, but it is assumed that Rotalidae forams, Miliammina fusca and Ammonia beccari, are important constituents of the test lining assemblages. Multi-chambered forms were classed by morphotype, size, number of chambers, spacing of chambers, and condition. The absence of a relationship between size and chamber number within each morphotype implies the presence of multiple species populations. There is also no relationship between foram concentration and salinity. Using stepwise discriminant analysis, six classes were selected which enable successful discrimination among the four salinity zones.

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