The Palm Spring Formation is a Pleistocene Epoch geologic formation in the eastern Colorado Desert of Imperial County and San Diego County County, Southern California.

Geology The Palm Spring Formation is an extensively-exposed delta-plain deposit debouched by the ancestral Colorado River across the subsiding Salton Trough.National Park Service: "The FISH CREEK CANYON ICHNOFAUNA: a PLIOCENE (BLANCAN) Vertebrate Footprint Assemblage from Anza-Borrego Desert State Park, California"; by Paul Remeika. It records the development of the prehistoric Colorado River delta cone into a barrier excluding marine waters from the Salton Trough. San Diego State University.edu: "Environments of deposition, Pliocene Imperial Formation, Southeast Coyote Mountains, Imperial County, California" ; Bell, Patricia J.; 1980.

Fossils It preserves fossils from the Pleistocene Epoch, during the Quaternary Period of the Cenozoic Era.

Lower Pliocene sub−period petrified wood is found in Anza-Borrego Desert State Park. The Lauraceae is represented by petrified Umbellularia, the Salicaceae with petrified Populus and Salix, and the Juglandaceae with petrified Juglans.

See also

Ocotillo Formation — fluvial-alluvial fan Pliocene formation

List of fossiliferous stratigraphic units in California Paleontology in California

References

Further reading