Robuta

https://www.usgs.gov/publications/late-cretaceous-foraminifera-paleoenvironments-and-paleoceanography-rosario-formation Late cretaceous foraminifera, paleoenvironments, and paleoceanography of the rosario formation, San... The 315 m of Rosario Formation exposed at the San Antonio del Mar (SADM) section (Baja California, Mexico) contains moderately-to-well preserved benthic and... late cretaceousof therosario formationforaminifera