Geologic units in Solano county, California

Additional scientific data in this geographic area

Quaternary alluvium and marine deposits (Pleistocene to Holocene) at surface, covers 49 % of this area

Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.

Older Quaternary alluvium and marine deposits (Pleistocene) at surface, covers 15 % of this area

Older alluvium, lake, playa, and terrace deposits.

Plio-Pleistocene and Pliocene loosely consolidated deposits (Miocene to Pleistocene) at surface, covers 15 % of this area

Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.

Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence) (Late Cretaceous) at surface, covers 8 % of this area

Upper Cretaceous sandstone, shale, and conglomerate

Eocene marine rocks (Paleocene to Oligocene) at surface, covers 5 % of this area

Shale, sandstone, conglomerate, and minor limestone; in part Oligocene and Paleocene.

Lower Cretaceous marine rocks (Early Cretaceous) at surface, covers 4 % of this area

Lower Cretaceous sandstone, shale, and conglomerate

Tertiary volcanic flow rocks, unit 3 (Sonoma Volcanic Field) (Tertiary (3-7 Ma)) at surface, covers 2 % of this area

Tertiary volcanic flow rocks; minor pyroclastic deposits.

Paleocene marine rocks, unit 1 (Central and Southern California) (Paleocene) at surface, covers 0.6 % of this area

Sandstone, shale, and conglomerate; mostly well consolidated

Franciscan Complex, unit 1 (Coast Ranges) (Jurassic to Cretaceous) at surface, covers 0.3 % of this area

Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm.

Quaternary large landslide deposits (Quaternary) at surface, covers 0.3 % of this area

Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary.