San Francisco Bay Region Geology and Geologic Hazards

Geologic Map of the San Francisco Bay Area

(Note: The following map below requires the Shockwave player to view. You can download the Shockwave player here. external link - link policy applies)

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Learn more about the labeled points on the map above.

  1. Monterey - plutonic rock (granite)
  2. Napa Valley - volcanic rock (obsidian)
  3. East of Napa Valley - metamorphic rock (slate)
  4. Oakland Hills - metamorphic rock (serpentinite)
  5. Lake Berryessa - sedimentary rock (sandstone and shale)
  6. Pescadero State Beach - sedimentary rock (sandstone with fossils)
  7. Marin Headlands - sedimentary rock (chert)
  8. Palo Alto - sediments (bay mud)
  9. Seaside, Monterey County - sediments (dune sand)
  10. East of Napa Valley - Mesozoic (dinosaur-age) marine fossil (Buchia)
  11. San Francisco - Mesozoic (dinosaur-age) marine fossil (ammonite)
  12. East of Livermore - Mesozoic (dinosaur-age) marine fossil (icthyosaur)
  13. Berkeley Hills - Cenozoic (mammal-age) fossil (beaver)
  14. Mount Diablo - Cenozoic (mammal-age) fossil (saber-toothed cat)
  15. San Jose - Cenozoic (mammal-age) fossil (mammoth)



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Page Last Modified: 8/18/2006