Chatsworth Formation

The Chatsworth Formation is a Cretaceous period sandstone geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.^{[1] [2]}

Chatsworth Formation
Stratigraphic range: Campanian & Maestrichtian epochs of Cretaceous
Chatsworth Formation at Stoney Point California
Type	Formation
Location
Region	Los Angeles County and Ventura County, California
Country	United States
Extent	Simi Hills, Santa Susana Mountains

It is found in western Los Angeles County and eastern Ventura County. The formation's thickness can be more than 610 metres (2,000 ft).^[3]

Fossils

The sedimentary marine formation preserves fossils dating from the Middle Campanian to Early Maestrichtian epochs of the Cretaceous period.^[1][4] It has diverse molluscan faunas.^[3]

The most common taxa are:^[5]

• ringiculid Biplica
• naticids Gyrodes and Euspira
• trochid Atira
• aporrhaids Anchuras and Lispodesthes
• turritellid Turritella
• perissityid Perissitys

See also

• Earth sciences portal
• California portal
• Paleontology portal

• Stoney Point (California) — Chatsworth Formation landmark.
• Cretaceous California
• Geology of Los Angeles County, California
• List of fossiliferous stratigraphic units in California
• Paleontology in California

References

1. AAPG Archives: Paleographic Interpretation of the Chatsworth Formation
2. Cleanuprocketdyne.org: Santa Susana Field Lab links to Chatsworth Formation groundwater contamination
3. USGS.gov: "Preliminary geologic map of the Santa Susana quadrangle, Southern California"
4. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
5. Overview of late cretaceous marine gastropods from the Simi Hills, by Mary Stecheson, Department of Geological Sciences, California State Univ, Northridge.