Rosario Group

The Rosario Group is a Late Cretaceous geologic group in southwestern California (United States) and northwestern Baja California (Mexico). In older literature it was named Rosario Formation.^[1]

Rosario Group
Stratigraphic range: Late Cretaceous
Type	Group
Sub-units	Lusardi Formation Cabrillo Formation Point Loma Formation
Underlies	Tertiary andesites, Quaternary deposits
Overlies	Mesozoic volcanic rocks
Thickness	1,200 m (3,900 ft)
Lithology
Primary	Marine mudstones, sandstones, conglomerates
Location
Region	Baja California, California
Country	Mexico, United States
Type section
Named for	El Rosario, Baja California

The Cretaceous aged formations of the Rosario Group include the Point Loma Formation, Cabrillo Formation and Lusardi Formation, in ascending order.^[2]

The sedimentary structures of the Rosario Group apparently were formed in a nearshore shelf environment, probably a local embayment.

Fossils

Some incomplete dinosaur fossils have been discovered in the Point Loma Formation dating back to the Cretaceous period of the Mesozoic Era.^[3]

See also

• California portal
• Mexico portal
• Paleontology portal

• Geology of San Diego County, California
• List of fossiliferous stratigraphic units in California