There have been not a great many full time Earth Science/Geology openings in California of late, but one has been announced in the Yuba Community College district:
Earth Science/Physical Science Instructor
Closing Date: April 8, 2011 Yuba Community College District ,
Marysville Faculty $52,592 - $100,879/YR.
Check out the CCC Registry here (search words Earth Science or Geology) for more details, and part-time opportunities in Marin, Monterey, Cerritos, Anaheim, San Francisco, and Bakersfield.