. Bulletins of American paleontology. Baja California Stratigraphy: Carreno and Smith 77 Isla San Esteban Plate 2. Column 33 (Text-fig. 46, Appendix I) Column is from Desonie (1992), who also published a reconnaissance geologic map. scale 1 cm represents km. Isla San Esteban is primarily a calc-alkaline volca- nic island in a zone of active rifting approximately 15 km southwest of Isla Tiburon. Desonie (1992) mapped an area of marine fossiliferous sandstone near the mouth of a major west to east drainage known as Ar- royo Limantour. She reported a dacitic flow below the marine rocks with a
. Bulletins of American paleontology. Baja California Stratigraphy: Carreno and Smith 77 Isla San Esteban Plate 2. Column 33 (Text-fig. 46, Appendix I) Column is from Desonie (1992), who also published a reconnaissance geologic map. scale 1 cm represents km. Isla San Esteban is primarily a calc-alkaline volca- nic island in a zone of active rifting approximately 15 km southwest of Isla Tiburon. Desonie (1992) mapped an area of marine fossiliferous sandstone near the mouth of a major west to east drainage known as Ar- royo Limantour. She reported a dacitic flow below the marine rocks with a radiometric age of ± Ma. Megafossils from this sandstone include the com- mon Late Pliocene index species Argopecten ahietis (Jordan and Hertlein) and other taxa that conelate the rocks with the Carmen-Marquer Formation, undiffer- entiated, in the Loreto embayment, the Infierno For- mation at Santa Rosalia, and unnamed sediments at Bahi'a de Guadalupe. Isla Cerralvo. and the Islas Tres Marias. Boleo Basin Plate 2. Column 34 (Text-hgs. 2, 49, 55, Appendices 1,2) Column modified from Touwaide (1930), I. F. Wil- son (1948). and 1. E Wilson and V. S. Rocha (1955). Area is shown on the Santa Agueda. Santa Rosalia and Punta Santa Ana quadrangles. G12A35, G12A36 and G12A25. respectively. 1 Geologic maps are included in I. E Wilson (194S). I. E Wilson and M. Veytia (1949). I. E Wilson and V. S. Rocha (1955), and Holt ct ul. (2000). Oveniew The Boleo basin lies along the central Gulf of Cal- ifornia, south of Caldera La Reforma and east of the Siena Santa Lucia. It could extend as far south as the northern tip of the Concepcion Peninsula. The basin includes the 33 km- Boleo Copper District, mined from 1885 to 1947 by the Compagnie du Boleo, and the Lucifer Manganese District. 12 km northwest of Santa Rosalia (I. F Wilson and M. Veytia. 1949). Its western edge is obscured by Tertiary volcanic arc rocks of the Sierra Santa Luci'a (Sawlan and J. G. Smith. 1984). A numbe
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