Ferrusquía-Villafranca, Ismael, Shelton P. Applegate, and Luis Espinosa-Arrubarrena. “First Paleogene Selachifauna of the Middle American-Caribbean Antillean Region, La Mesa De Copoya, West-Central Chiapas, Mexico—Geologic Setting”. Revista Mexicana de Ciencias Geológicas 17, no. 1 (July 9, 2018): 1–23. Accessed April 20, 2025. https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/1014.