Ashby, J.R., and J.A. Minch. “Stratigraphy And Paleoecology Of The Mulege Embayment, Baja California Sur, Mexico”. Ciencias Marinas 13, no. 2 (March 6, 1987): 89–114. Accessed June 25, 2024. https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/530.