Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Quaternary pyroclastic and volcanic mudflow deposits.
Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene.
Shale, sandstone, conglomerate, and minor limestone; in part Oligocene and Paleocene.
Upper Cretaceous sandstone, shale, and conglomerate
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.