Vega, F. J. (2018) “El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico”, Revista Mexicana de Ciencias Geológicas, 23(3), pp. 323–333. Available at: https://rmcg.unam.mx/index.php/rmcg/article/view/821 (Accessed: 15 March 2025).