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Fernando Formation facts for kids

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Fernando Formation
Stratigraphic range: Plio-Pleistocene
Type Geologic formation
Underlies Pico Formation
Overlies Repetto Formation
Primary Mudstone, siltstone, sandstone
Region Los Angeles Basin, Santa Monica Mountains
Los Angeles County, California
Country United States

The Fernando Formation is a Plio-Pleistocene marine mudstone, siltstone and sandstone formation in the greater Los Angeles Basin, Ventura Basin, and Santa Monica Mountains, in Los Angeles County of Southern California.


Outcrops of the formation in Santa Monica Mountains National Recreation Area have produced fossil shark teeth.


The underlying Repetto Formation is equivalent in age to the Fernando Formation, and some researchers consider it as well as the overlying Pico Formation to be a junior synonym based on benthic foraminifera stages. Other researchers maintain that the Repetto and Pico Formations are distinct stratigraphic units, and that the use of the name "Fernando Formation" should be stopped due to several issues with stratigraphic correlation and access to the type section.

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