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.
See also
- Geology of San Diego County, California
- List of fossiliferous stratigraphic units in California
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
- Michael P. Kennedy; George W. Moore (1971). "Stratigraphic Relations of Upper Cretaceous and Eocene Formations, San Diego Coastal Area, California". AAPG Bulletin. 55 (5): 709–722, 709–722. doi:10.1306/819A3C5A-16C5-11D7-8645000102C1865D. ISSN 0149-1423. Wikidata Q108701240.
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.
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