“…The Mural Formation in northecentral Sonora, Mexico, is part of the Bisbee Group (Ransome, 1904), which overlies Jurassic and older strata in Arizona and New Mexico as well as in Sonora (CantuChapa, 1976;Bilodeau and Lindberg, 1983;Mack et al, 1986;Dickinson et al, 1989;Jacques-Ayala, 1995;Lawton et al, 2004). The Bisbee Group is composed of basal siliciclastics overlain by the uppermost Aptian-lower Albian Mural Formation, which records the latest Aptian-earliest Albian transgression into Sonora, southern Arizona and New Mexico (Scott, 1987;Warzeski, 1983;Gonz alez-Le on et al, 2008).…”