. Bulletins of American paleontology. Bulletin 371 Bl Rosaiiii, Piinta Baja Punta San Antoi. liiwii/villagc Mexico hiiihwav I Puma '^0^/^, Eugenia Punta dc 6^Gucrri-i>- M5 W 1I4W lext-tigure fi.—Soiuhcrn Rdsann emhayinenl. map shosving tl Rosario to 28° N. including ^le^a la Scpultura, Mesa San Carlos. Pinila Maria, and Lonias lav Tctas dc Cabra. The mesa-toniiing scdiniLMiLs Gabb observed be- tween La Paz and Ensenada ate now referred to a num- ber of different units, both Mesozoic and Ceno/oic, sedimentary and igneous. Early workers, including Lindgren liS88, 1889. 1890). Emmons and Merri
. Bulletins of American paleontology. Bulletin 371 Bl Rosaiiii, Piinta Baja Punta San Antoi. liiwii/villagc Mexico hiiihwav I Puma '^0^/^, Eugenia Punta dc 6^Gucrri-i>- M5 W 1I4W lext-tigure fi.—Soiuhcrn Rdsann emhayinenl. map shosving tl Rosario to 28° N. including ^le^a la Scpultura, Mesa San Carlos. Pinila Maria, and Lonias lav Tctas dc Cabra. The mesa-toniiing scdiniLMiLs Gabb observed be- tween La Paz and Ensenada ate now referred to a num- ber of different units, both Mesozoic and Ceno/oic, sedimentary and igneous. Early workers, including Lindgren liS88, 1889. 1890). Emmons and Merrill (1894). and Willis and Stose (1912). attached the name to Cretaceous rocks in the Ensenada area; Darton ( 192!) used it for rocks overlying the ""Yellow beds" in Arroyo la Purisima. but did not call it a formation. Heim (1922: 530) pointed out that the "so-called Mesa sandstone" of the northern peninsula is Late Creta- ceous and lithologically different from the Tertiary age ""Mesa Sandstone" of the southern peninsula. As such, he concluded, the name could not be applied to a stratigraphic unit; it was neither a useful nor a \;ilid term. Southern Rosario embayment Plate I. Columns 5. 6 (Te.\t-Hgs. 2, 6. Table 3. Appendices ) The main part of the southern Rosario embayment extends from north of the tow n of El Rosario to PLUita Canoas. north of the Baja California/Baja California Sur state line ( 6). It is underlain by Late Cre- taceous to Paleocene deep marine to nonmarine sedi- ments that have undergone tectonic subsidence and up- lift, folding, faulting, and tilting. Bushy er al. (1998) reviewed the stratigraphic imits within the tecttMiic and depositional settings of the Peninsular Ranges fore-arc basin. Sections at Mesa la Sepultura and Mesa San Carlos were sampled tVir evidence of the K/T boundary (Abbott ct 1993b). but it was not found in either sequence. Geologic maps and stratigraphic summaries of selected
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