VEGA, Francisco J.; GARCÍA-BARRERA, Pedro; PERRILLIAT, María del Carmen; COUTIÑO, Marco A.; MARIÑO-PÉREZ, Ricardo. El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico. Revista Mexicana de Ciencias Geológicas, [S. l.], v. 23, n. 3, p. 323–333, 2018. Disponível em: https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/821. Acesso em: 18 apr. 2025.