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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 edit
Some incomplete dinosaur fossils have been discovered in the Point Loma Formation dating back to the Cretaceous period of the Mesozoic Era.
See also edit
References edit
- ^ 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 edit
- 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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