放射性定年法
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 and Namibian Whitehill Formation, of the Paraná Basin and Karoo Basin respectively, puts it at around the Artinskian Age (about 279 ± 6 million years ago).