The Chatsworth Formation is a Cretaceous period sandstone geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.AAPG Archives: Paleographic Interpretation of the Chatsworth Formation Cleanuprocketdyne.org: Santa Susana Field Lab links to Chatsworth Formation groundwater contamination
It is found in western Los Angeles County and eastern Ventura County. The formation's thickness can be more than .USGS.gov: "Preliminary geologic map of the Santa Susana quadrangle, Southern California"
Fossils 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:Overview of late cretaceous marine gastropods from the Simi Hills, by Mary Stecheson, Department of Geological Sciences, California State Univ, Northridge. ringiculid Biplica naticids Gyrodes and Euspira trochid Atira aporrhaids Anchuras and Lispodesthes turritellid Turritella perissityid Perissitys
See also
Stoney Point (California) — Chatsworth Formation landmark.
List of fossiliferous stratigraphic units in California Paleontology in California
References