Rosario Group

Rosario Group
Stratigraphic range: Late Cretaceous
Type	Group
Sub-units	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 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.

The Rosario Group includes the Point Loma Formation and Cabrillo Formation subunits in San Diego County, California.

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

Fossils

It preserves fossils dating back to the Cretaceous period of the Mesozoic Era.

See also

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

Further reading

• JSTOR.org: "Dynamics of Late Cretaceous Rocky Shores (Rosario Formation) from Baja California, Mexico"; by Halard L. Lescinsky, Jorge Ledesma-Vázquez and Markes E. Johnson; SEPM Society for Sedimentary Geology; PALAIOS, Vol. 6, No. 2 (Apr., 1991), pp. 126–141.
• SDSU.edu: "Paleocurrent analysis of the Cretaceous Rosario Formation"; Bailey, Stephen Milton; 1966-08-10.

External links

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014. {{cite web}}: |author= has generic name (help)