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) ~11.6–5.3 Ma | |
|---|---|
| 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 |  |
| Extent | Sierra Region |
  Letrero Formation (Ecuador) | |
Fossil content
The formation has provided fossils of:
- Anadasypus aequatorianus[2]
- Caviomorpha indet.
- Litopterna indet.
- Toxodontia indet.
References
- RHM Locality 4 at Fossilworks.org
- Carlini et al., 2014
Bibliography
- Carlini, Alfredo A.; Mariela C. Castro; Richard H. Madden, and Gustavo J. Scillato Yané. 2013. A new species of Dasypodidae (Xenarthra: Cingulata) from the late Miocene of northwestern South America: implications in the Dasypodini phylogeny and diversity. Historical Biology: An International Journal of Paleobiology 26. 728–736. Accessed 2019-02-09.
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