Omaña, Lourdes, Jose Maria Pons, and Ruben Cruz. “Biostratigraphy and Paleoenvironment of Maastrichtian Foraminiferal Assemblages from a Succession Located NW of Tuxtla Gutiérrez, Chiapas (SE Mexico)”. Revista Mexicana de Ciencias Geológicas 38, no. 1 (March 24, 2021): 65–81. Accessed March 15, 2025. https://rmcg.unam.mx/index.php/rmcg/article/view/1598.