Stevens, Calvin H., Forrest G. Poole, Forrest G. Poole, Ricardo Amaya-Martínez, and Ricardo Amaya-Martínez. “Late Paleozoic Fusulinids from Sonora, México: Importance for Interpretation of Depositional Settings, Biogeography, and Paleotectonics”. Revista Mexicana de Ciencias Geológicas 31, no. 1 (February 25, 2015). Accessed April 23, 2025. https://rmcg.unam.mx/index.php/rmcg/article/view/260.