Mangrullo Formation
| Mangrullo Formation Stratigraphic range: Artinskian ~286–273 Ma |
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The areal extent of the Paraná Basin of which the Mangrullo Formation is part of
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| Type | Geological formation |
| Unit of | Cerro Largo Group |
| Underlies | Paso Aguiar Formation |
| Overlies |
Fraile Muerto Formation, Tres Islas Formation |
| Thickness | 40 m (130 ft) |
| Lithology | |
| Primary | Shale, claystone, siltstone, limestone |
| Location | |
| Coordinates | 32°13′S 54°07′W / 32.22°S 54.11°WCoordinates: 32°13′S 54°07′W / 32.22°S 54.11°W |
| Country |
 Uruguay
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| Type section | |
| Named for | Mangrullo, Cerro Largo |
The Mangrullo Formation is a Lower Permian (Artinskian) fossil locality in northeastern Uruguay. Some authors alternatively group it together with the Paso Aguiar Formation and the Fraile Muerto Formation as the three subdivisions of the Melo Formation, in which case it is referred to as the Mangrullo Member. Like the correlated formations of Irati and Whitehill, it is known for its abundant mesosaur fossils. It also contains the oldest known Konservat-Lagerstätte in South America, as well as the oldest known fossils of amniote embryos.
The Mangrullo Formation is part of the Cerro Largo Group of the Paraná Basin infill of South America.Radiometric dating and fossil assemblage correlation with the Brazilian Irati Formation and the South African Whitehill Formation, of the Paraná Basin and Karoo Basin respectively, puts it at around the Artinskian Age (about 279 ± 6 million years ago).
It has a thickness of nearly 40 m (130 ft). It consists primarily of beds of variable thickness of sandy and dolomitic limestone and laminated oil shale, claystone, and siltstone.
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