Omaña, L.; López-Caballero, I.; Nuñez-Useche, F. A Late Aptian Planktic Foraminiferal Assemblage and Pyrite Framboids from the “Otates Horizon”, Cerro Boludo, Hidalgo, Mexico: Paleoecological and Paleoenvironmental Implications. revmexcg 2022, 39, 71-81.