Palm Spring Formation
Stratigraphic range: Lower Pleistocene

Type| Geologic formation
Underlies| Vallecito Badlands
Overlies| Imperial Formation, Ocotillo Formation
Location
Region| Colorado Desert, California
Country| United States

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.

## Contents

* 1 Geology
* 1.1 Fossils
* 2 See also
* 3 References
* 4 Further reading

## Geology

The 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]

### Fossils

It 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

* Ocotillo Formation — fluvial-alluvial fan Pliocene formation
* Quaternary California
* List of fossiliferous stratigraphic units in California
* Paleontology in California

## References

1. ↑ National Park Service: "The FISH CREEK CANYON ICHNOFAUNA: a PLIOCENE (BLANCAN) Vertebrate Footprint Assemblage from Anza-Borrego Desert State Park, California"; by Paul Remeika.
2. ↑ San Diego State University.edu: "Environments of deposition, Pliocene Imperial Formation, Southeast Coyote Mountains, Imperial County, California" ; Bell, Patricia J.; 1980.
3. ↑ ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". https://www.fossilworks.org/.
4. ↑ 4.0 4.1 Remeika, Paul; Fischbein, Irwin W.; Fischbein, Steven A. (1988). "Lower Pliocene petrified wood from the Palm Spring Formation, Anza Borrego Desert State Park, California". Review of Palaeobotany and Palynology 56 (3–4): 183–198. doi:10.1016/0034-6667(88)90057-7.

## Further reading

* Weber, F. Harold (1963). Geology and mineral resources of San Diego County, California. California Division of Mines and Geology. p. 32. https://archive.org/details/geologyandminer03webe.

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Quaternary Period

| Pleistocene Epoch| Holocene Epoch

|

* Early
* Middle
* Late

* Meghalayan
* Northgrippian
* Greenlandian
* Preboreal
* Boreal
* Atlantic
* Subboreal
* Subatlantic

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