Rosario Group
| 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 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.
The Cretaceous aged formations of the Rosario Group include the Point Loma Formation, Cabrillo Formation and Lusardi Formation, in ascending order.
The sedimentary structures of the Rosario Group apparently were formed in a nearshore shelf environment, probably a local embayment.