The Scripps Formation is a

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

in coastal

San Diego County San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the f ...

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

. San-diego.us: San Diego Geology
. accessed 7.7.2015Geiconsultants.com: Geologic Formations of Western San Diego County
by Jeffrey D. Brown, R.G., C.E.G. − circa 1996. It is named for its type section north of the Scripps Pier, on the north side of the Blacks Canyon mouth.

Geography

It underlies much of the area from east of Del Mar on the north to the mouth of

Mission Valley Mission Valley is a wide river valley trending east–west in San Diego, California, United States, through which the San Diego River flows to the Pacific Ocean. For planning purposes the city of San Diego divides it into two neighborhoods: Miss ...

on the south, and extends north to the

Encinitas Encinitas (Spanish for "Small Oaks") is a beach city in the North County area of San Diego County, California. Located within Southern California, it is approximately north of San Diego, between Solana Beach and Carlsbad, and about south of ...

area. Along the coast, it can be seen from central

Torrey Pines State Park Torrey Pines State Natural Reserve is of coastal state park located in the community of La Jolla, in San Diego, California, off North Torrey Pines Road. Although it is located within San Diego city limits, it remains one of the wildest stretches ...

to the

Scripps Institution of Oceanography The Scripps Institution of Oceanography (sometimes referred to as SIO, Scripps Oceanography, or Scripps) in San Diego, California, US founded in 1903, is one of the oldest and largest centers for ocean and Earth science research, public servi ...

, in

La Jolla La Jolla ( , ) is a hilly, seaside neighborhood within the city of San Diego, California, United States, occupying of curving coastline along the Pacific Ocean. The population reported in the 2010 census was 46,781. La Jolla is surrounded on ...

. In the north near Encinitas, it correlates with the upper Torrey Sandstone.

Geology

It overlies the Ardath Shale, and underlies the

Friars Formation 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, named for exposures along the north ...

. Sea level rose and fell often during this period of the Eocene Epoch in geologic history. About 42 million years ago, sea level rose again and more sand was deposited. Compressed and cemented, it makes the rock known as the Scripps Formation. This rock holds up the sea bluffs north of Moonlight Beach. Because the mudstone and siltstone of the Ardath Formation are softer and weaker layers, waves erode it and undermine the stronger Scripps Formation sandstone above it, as happens with the Del Mar Formations below Torrey Formations.

Fossil content

Fossil 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 ...

s are present but are less common in the Scripps Formation than in the underlying Ardath Shale. Those it preserves date back to the Eocene Epoch of the

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

period, during the

Cenozoic Era The Cenozoic ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterised by the dominance of mammals, birds and flowering plants, a cooling and drying climate, and the current configu ...

Geography

Geology

Fossil content

See also

References

Further reading