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°18′S 35°06′E / 10.3°S 35.1°E |
Approximate paleocoordinates | 55°06′S 15°12′E / 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 |
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.[1][2]