Rosario Group

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 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]

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

References

  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


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