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Mangrullo Formation
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.〔(【引用サイトリンク】title=Arroyo de La Mina (Permian of Uruguay) )〕 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.〔
==Geology==
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 . It consists primarily of beds of variable thickness of sandy and dolomitic limestone and laminated oil shale, claystone, and siltstone.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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