Santa Susana Formation

The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.^[1][2][3]

Santa Susana Formation
Stratigraphic range: Late Paleocene-Early Eocene
Type	Formation
Underlies	Meganos Formation
Overlies	Martinez Formation
Thickness	1,000–1,500 ft (300–460 m)
Lithology
Primary	Shale
Other	Sandstone, conglomerate
Location
Region	Los Angeles County and Ventura County, California
Country	United States
Extent	Simi Hills, Santa Susana Mountains
Type section
Named for	Santa Susana, California

The formation consists largely of light-gray shale and some fine-grained shaly sandstone, with a lens of heavy conglomerates in the lower part.^[1][4] Small beds of limestone are also present.^[5] It is from 1,000 to 1,500 feet (300 to 460 m) thick.^[1][4]

Fossil content

The Santa Susana Formation preserves fossils from the Late Paleocene to Early Eocene epochs in the Paleogene period of the Cenozoic Era.^[4][6] Fossilized fauna in the Santa Susana Formation is entirely different from that of underlying Martinez Formation, and has very little in common with that of the overlying Meganos Formation.^[1][3][7]

See also

• Earth sciences portal
• California portal
• Paleontology portal

• Geology of Los Angeles County, California
• List of fossiliferous stratigraphic units in California
• Paleogene California
• Paleontology in California