Biostratigraphy of the Dinodontosaurus and Santacruzodon AZs.
Tetrapod fossil comparisons and shared taxa with the Chañares Formation of western Argentina. The ages of the column follow Gradstein et al. . The radiometric dating of 236.1, 231.4 and 225.9 Ma on the Ischigualasto-Villa Unión Basin column correspond to the first half of the Chañares Formation , the base of the Ischigualasto Formation, and the base of Los Colorados Formation , respectively, and the one in the Santacruzodon AZ follows Philipp et al. .