Usili Formation
The Usili Formation is a Late Permian geologic formation in Tanzania. It preserves fossils of many terrestrial vertebrates from the Permian, including temnospondyls, pareiasaurs, therapsids and the archosauromorph Aenigmastropheus.
| Usili Formation | |
|---|---|
| Stratigraphic range: Lopingian ~ | |
| Type | Geological formation |
| Unit of | Songea Group |
| Underlies | Manda Formation |
| Overlies | Ruhuhu Formation |
| Thickness | 260 m (850 ft) |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Other | Siltstone, mudstone |
| Location | |
| Coordinates | 10.3°S 35.1°E |
| Approximate paleocoordinates | 55.1°S 15.2°E |
| Region | Ruvuma Region |
| Country | Tanzania |
| Extent | Ruhuhu Basin |
| Type section | |
| Named for | Usili Mountain |
| Named by | Stockley |
| Year defined | 1932 |
Usili Formation (Tanzania) | |
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