Rosario Formation

Rosario Formation
Stratigraphic range: Late Cretaceous epoch,
Cretaceous Period
Type Formation
Sub-units Cabrillo Formation
Point Loma Formation
Underlies Tertiary andesites, Quaternary deposits
Overlies Mesozoic volcanic rocks
Thickness 1,200 metres (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 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.

See also

References


Cretaceous Period
Lower/Early Cretaceous Upper/Late Cretaceous
Berriasian | Valanginian | Hauterivian
Barremian| Aptian | Albian
Cenomanian | Turonian | Coniacian
Santonian |Campanian | Maastrichtian



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