The Friars Formation is a geologic formation in San Diego County, Southern California.

Geology

It is the uppermost unit of the La Jolla Group. The rocks are nonmarine and lagoonal sandstone and

claystone Mudrocks are a class of fine-grained siliciclastic sedimentary rocks. The varying types of mudrocks include siltstone, claystone, mudstone, slate, and shale. Most of the particles of which the stone is composed are less than and are too sm ...

, named for exposures along the north side of Mission Valley near Friars Road. It reaches a maximum thickness of between Mission Valley and Carmel Valley.

Fossils

It preserves

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...

dating back to the middle and late Eocene epoch of the

Paleogene The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...

period, during the Cenozoic Era.

Geology

Fossils

See also

References

Further reading