. Bulletins of American paleontology. Caluornia SiKAriciRAPH'i: Carri;no and Smuh 95. Texl-liyiiie 73.—San Juan Uc la Costa and ihe Pa/ |icnlnsnla to Cabo San Lucas, index map of key localities. Map was niodilied from Aranda-Gome/ and Pere/.-Venzor (19S9). Scliwennickc cf nl. (1996). and Fletcher ct ul. (2000). Arroyo la Muela exposes the southernmost outcrops of the Miocene Salada Formation; Miocene whales were excavated near La Palma. the unnamed ranch<i shown north of San Pedro. K/Ar ages are 21-24 Ma for the La Pa/ tuff at AiToyo el Sauzoso (Hausback. ) and lS-20 Ma for
. Bulletins of American paleontology. Caluornia SiKAriciRAPH'i: Carri;no and Smuh 95. Texl-liyiiie 73.—San Juan Uc la Costa and ihe Pa/ |icnlnsnla to Cabo San Lucas, index map of key localities. Map was niodilied from Aranda-Gome/ and Pere/.-Venzor (19S9). Scliwennickc cf nl. (1996). and Fletcher ct ul. (2000). Arroyo la Muela exposes the southernmost outcrops of the Miocene Salada Formation; Miocene whales were excavated near La Palma. the unnamed ranch<i shown north of San Pedro. K/Ar ages are 21-24 Ma for the La Pa/ tuff at AiToyo el Sauzoso (Hausback. ) and lS-20 Ma for the Prov- idencia Rhyodacite (Hausback. ms?). EC. Rancho El Carrizal; FB. Farallones Blancos; SJC. San .luan de la Costa; faults include CF El Cani/al Fault; SJF San Jose del Cabo Fault; LTF 1-a TrniKkid Fault. Isla Espiritii Santi) and Isia la Pallida Plate 2. Column 41 (Te.\t-tig. 73) Columns aflei Hausback (19S4h. 1987) and Aianda- Gonie/ and Poie/Ven/Atr (19X8): the area is shown on the geologic maps of Hausback (). Aianda-G6- mez and Perez-Venzor (1986, 1988). and the El Coy- ote quadrangle. G 12 D73. scale 1 Overview The La Paz peninsula and islands to the noith-noith- west are composed primarily of Miocene volcanic rocks overlying Cretaceous tonalite, granodioritc. granite, and calcareous metsediments. the La Paz Ci vslalliiic Complex of Ortega-Gutierrez ( 1982). The volcanic arc that contributed these flows, tuffs, and breccia was northeast of the present La Paz peninsula when the area lay against mainland Mexico. An im- portant structural feature is the La Paz Fault, which traverses the peninsula from southern Baja California Sur near Todos Santos to a kilometer west of Punta Coyote and along the eastern part of the islands (Text- tig. 73). Isla Esptrim Sanlo and Isla Partida Cretaceous (?) basement rocks crop out in the south- eastern part of Isla Espiritu Santo. Aranda-Gomez and Perez-Venzor (1986) describeel them informally as the Pailebot augen gn
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