Angostura Formation, Ecuador
Geologic formation in Ecuador
From Wikipedia, the free encyclopedia
The Angostura Formation is a Late Miocene (Mayoan to Montehermosan in the SALMA classification) geologic formation of the Borbón Basin in northwestern Ecuador.[1]
| Angostura Formation | |
|---|---|
| Stratigraphic range: Late Miocene (Mayoan-Montehermosan) ~ | |
| Type | Geological formation |
| Unit of | Santiago Group |
| Underlies | Onzole Formation |
| Overlies | Viche Formation |
| Thickness | 150 m (490 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Conglomerate |
| Location | |
| Coordinates | 1.0°N 79.6°W |
| Approximate paleocoordinates | 0.6°N 78.0°W |
| Region | Esmeraldas Province |
| Country | Ecuador |
| Extent | Borbón Basin |
  Angostura Formation, Ecuador (Ecuador) | |
Description
The coarse sandstones and beds of conglomerates, about 150 metres (490 ft) in thickness. The formation is resistant to erosion and is largely barren, but at a few places there are lenses or interbeds filled with finely preserved fossils. The formation overlies the Viche Formation, and is overlain by the lower Onzole Formation. The Angostura Formation is time-equivalent with the fossiliferous Gatún Formation of Panama.[1]