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
TypeGroup
Sub-unitsLusardi Formation
Cabrillo Formation
Point Loma Formation
UnderliesTertiary andesites, Quaternary deposits
OverliesMesozoic volcanic rocks
Thickness1,200 m (3,900 ft)
Lithology
PrimaryMarine mudstones, sandstones, conglomerates
Location
RegionBaja California, California
CountryMexico, United States
Type section
Named forEl 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
  1. ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
  2. ^ 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