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Chatsworth Formation facts for kids

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

The Chatsworth Formation is a Cretaceous period sandstone geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.

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).


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

The most common taxa are:

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