Study of six subgenera of Venericardia from the Cenozoic of the Atlantic and Gulf Coastal Province indicates that each subgenus has its own characteristic ecology and that some subgenera have undergone changes in ecology during Cenozoic time. This study was based on 198 samples which were compared on ecological bases, independent of spatial and temporal controls, by means of a morphologic analysis of the contained microfaunas. The comparisons were effected by an ordination technique in which similarity coefficients were computed for all the assemblages, and the assemblages were positioned in a three-dimensional model which expressed their environmental relationships.

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