Pessagnoites, a new foraminifer genus from the Upper Cretaceous of the Austin Chalk, northeast Texas

摘要

A new genus Pessagnoites is described from the Austin Chalk of Northeast Texas. This taxon is included in the Marginotruncanidae and is characterized by possessing an extraumbilical-non umbilical in position primary aperture and sutural supplementary apertures both on the spiral and umbilical sides of the test. Pessagnoites n. gen. marks the base of the lowermost Coniacian (Superzone UK4, Zone 4B) in Texas. Its co-occurrence with Cremnocreamus deformis erectus herein suggests its placement as a primary marker tax on marking the base of the Contadina worldwide.