La Portada Formation
From Wikipedia, the free encyclopedia
La Portada Formation (Spanish: Formación La Portada) is a geologic formation of Miocene and Pliocene age located near the Coast Range of northern Chile. The coarse-grained sandstones of the formation contain penguin fossils.[1][2]
| La Portada Formation | |
|---|---|
| Stratigraphic range: Miocene–Pliocene | |
 View of La Portada, the namesake arch made of La Portada Formation rocks resting on darker rocks of Jurassic La Negra Formation | |
| Type | Geological formation |
| Sub-units | Cerro Bandurrias & Cuesta del Burro Members |
| Underlies | Mejillones Formation |
| Overlies | Caleta Herradura Formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 23.4°S 70.5°W |
| Approximate paleocoordinates | 23.6°S 69.5°W |
| Region | Antofagasta Region |
| Country |  Chile |
| Type section | |
| Named for | La Portada de Antofagasta |
  La Portada Formation (Chile) | |
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