Blau, J., Meister, C., Schmidt-Effing, R., & Villaseñor, A. B. (2018). A new fossiliferous site of Lower Liassic (Upper Sinemurian) marine sediments from the southern Sierra Madre Oriental (Puebla, Mexico): ammonite fauna, biostratigraphy, and description of Ectocentrites hillebrandti new species. Revista Mexicana De Ciencias Geológicas, 25(3), 402–407. Retrieved from https://rmcg.unam.mx/index.php/rmcg/article/view/683