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
- Geology of San Diego County, California
- List of fossiliferous stratigraphic units in California
References
- 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.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 8 July 2014.
| Cretaceous Period | |
|---|---|
| Lower/Early Cretaceous | Upper/Late Cretaceous |
| Berriasian | Valanginian | Hauterivian Barremian| Aptian | Albian |
Cenomanian | Turonian | Coniacian Santonian |Campanian | Maastrichtian |
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