Letrero Formation
The Letrero Formation is a Late Miocene (Mayoan to Montehermosan in the SALMA classification) geologic formation in south-central Ecuador. The formation comprises lacustrine sediments with strong fluvial clastic input and contains siltstones and fine-grained sandstones.[1]
| Letrero Formation | |
|---|---|
| Stratigraphic range: Late Miocene (Mayoan-Montehermosan) ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Siltstone |
| Other | Sandstone |
| Location | |
| Coordinates | 3.3°S 79.1°W |
| Approximate paleocoordinates | 3.7°S 77.4°W |
| Region | Azuay Province |
| Country |  Ecuador |
| Extent | Sierra Region |
  Letrero Formation (Ecuador) | |
Fossil content
The formation has provided fossils of:
- Anadasypus aequatorianus[2]
- Caviomorpha indet.
- Litopterna indet.
- Toxodontia indet.
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