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Baja California and the Sea of Cortez

Baja California and the Sea of Cortez. Tijuana. Ensenada. San Felipe. San Quintin. El Rosario. Bahia de Los Angeles. Guerrero Negro. Santa Rosalia. Mulege. Bahia Concepcion. Bahia Magdalena. La Paz. Cabo San Lucas. Geology of Baja California.

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Baja California and the Sea of Cortez

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  1. Baja California and the Sea of Cortez

  2. Tijuana Ensenada San Felipe San Quintin El Rosario Bahia de Los Angeles Guerrero Negro Santa Rosalia Mulege Bahia Concepcion Bahia Magdalena La Paz Cabo San Lucas

  3. Geology of Baja California

  4. Pacific Plate moves NW past N. American Plate • San Andreas fault between

  5. Early Miocene: • Part of shore or underwater • Some mountains as islands tropics Murphy, 1983 as quoted in Grismer, unpublished

  6. Middle Miocene: • Mountains rose • Mainland subsided • Gulf began to form • S. peninsula separated from mainland, became island tropics Murphy, 1983 as quoted in Grismer, unpublished

  7. Late Miocene: • Mountain chains connected, forming a contiguous peninsula tropics Murphy, 1983 as quoted in Grismer, unpublished

  8. Miocene-Pliocene: • Rapid tectonic activity • Pacific plate moved north • Mountains rose more • Sea level rose, isolating south end • Gulf extended far north tropics Murphy, 1983 as quoted in Grismer, unpublished

  9. Late Pliocene-Present: • Mountain uplift • Desertification • Gulf regressed • Temporary land bridges to islands tropics Murphy, 1983 as quoted in Grismer, unpublished

  10. History of Baja California

  11. Gúzman Cortez 1535 Becerra 1533 Cortez Mendoza 1532

  12. English map 1641

  13. English map 1641

  14. Vizcaino 1596 Cabrillo 1542 Vizcaino 1602 Cavendish 1586 Mendoza galleons 1542 Francis Drake 1578

  15. Oceanography of the Gulf of California/Sea of Cortez

  16. California Province Caribbean Province Panamic Province

  17. California Province Panamic Province Caribbean Province Gulf Invertebrates: • 21% endemic in gulf • 41% Panamic • 18% Californian • 4% Caribbean • 8% Cosmopolitan

  18. Ebeling 1985

  19. Ebeling 1985

  20. Ebeling 1985

  21. Ebeling 1985

  22. Ebeling 1985

  23. Prevailing Westerlies Typhoons

  24. North: Rain winter & spring Pacific: Cool, foggy, surf Gulf: Dry, hot, calm Center: Dry South: Storms June-October

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