Trisha Shetty (Editor)

Rosario Formation

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Type  Formation
Thickness  1,200 m
Primary  Sandstone, Conglomerate
Country  Mexico, United States
Named for  El Rosario
Sub-units  Cabrillo Formation Point Loma Formation
Underlies  Tertiary andesites, Quaternary deposits
Overlies  Mesozoic volcanic rocks
Regions  Baja California, California

The Rosario Formation or Rosario Group is a Late Cretaceous epoch geologic formation in southwestern California (U.S.) and northwestern Baja California (México).

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

The sedimentary structures of the Rosario Formation 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.

References

Rosario Formation Wikipedia


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