Topanga Formation

Topanga Canyon Formation Stratigraphic range: Neogene
Type	Formation
Underlies	Modelo Formation
Location
Region	Santa Monica Mountains Los Angeles County, California
Country	United States

The Topanga Canyon Formation is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California. It is primarily composed of hard sandstone with some inter-bedded siltstone.

It preserves fossils dating back to the Miocene epoch of the Neogene period, during the Cenozoic Era.