Palm Spring Formation
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. GeologyThe Palm Spring Formation is an extensively-exposed delta-plain deposit debouched by the ancestral Colorado River across the subsiding Salton Trough.[1] It records the development of the prehistoric Colorado River delta cone into a barrier excluding marine waters from the Salton Trough.[2] FossilsIt preserves fossils from the Pleistocene Epoch, during the Quaternary Period of the Cenozoic Era.[3] Lower Pliocene sub−period petrified wood is found in Anza-Borrego Desert State Park.[4] The Lauraceae is represented by petrified Umbellularia, the Salicaceae with petrified Populus and Salix, and the Juglandaceae with petrified Juglans.[4] See also
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