Insoluble residues from the Columbus limestone yielded 33 species belonging to 10 genera of arenaceous foraminifera, which are described here; among them are 2 new genera, Weikkoella and Fairliella, and 19 new species. A discussion of morphologic features of these foraminifera includes a comparative evaluation of their taxonomic use in this study. The associated fauna is summarized, and implications of the ecology are suggested, namely, a warm, somewhat shallow marine environment.