The Río Colorado Subgroup, formerly named as Río Colorado Formation, is a Late Cretaceous (Santonian to Early Campanian) geologic subgroup of the Neuquén Basin in northern Patagonia, Argentina. It belongs to the Neuquén Group and contains the Anacleto and Bajo de la Carpa Formations. The subgroup overlies the Río Neuquén Subgroup and is overlain by the Allen Formation of the Malargüe Group, separated by an unconformity dated to 79 Ma.Leanza et al., 2004, p.63 Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.Weishampel et al., 2004, pp. 603-604
Fossil content
Ornithischians Ornithischians reported from the Río Colorado Subgroup Genus Species Province Stratigraphic position Material Notes ImagesGasparinisauraG. cincosaltensis Río Negro Province"63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Page 604. Anacleto Formation"Skull and postcranial skeleton, postcranial elements, juvenile to subadult.""Table 18.1," in Weishampel, et al. (2004). Page 395.
Sauropods Titanosaur eggs are known from Neuquén Province."63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation," in Weishampel, et al. (2004). Page 603.
Sauropods reported from the Río Colorado Subgroup Genus Species Province Stratigraphic position Material Notes ImagesAntarctosaurusA. wichmannianus Río Negro Province Anacleto FormationBonatitan<ref name="rionegro" />B.reigi<ref name="rionegro" /> Río Negro Province Allen FormationLoricosaurusListed as "?Loricosaurus scutatus" in "63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation" and "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Pages 603-604.L. scutatus Neuquén Province Río Negro ProvinceMicrocoelusM. patagonicus Neuquén Province Bajo de la Carpa FormationPossible synonym of NeuquensaurusNeuquensaurusN. australis Neuquén Province Río Negro Province Anacleto Formation"Titanosaurus""T." robustus Río Negro Province Anacleto FormationTitanosaurus"63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation" and "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Pages 603-604.T. nanus Neuquén Province Bajo de la Carpa Formation
Theropods
Theropods reported from the Río Colorado Subgroup Genus Species Province Stratigraphic position Material Notes ImagesAbelisaurusA. comahuaensis Río Negro Province Anacleto Formation"Partial skull.""Table 3.1," in Weishampel, et al. (2004). Page 49.AlvarezsaurusA. calvoi Neuquén Province Bajo de la Carpa Formation"Partial postcranial skeleton.""Table 11.1," in Weishampel, et al. (2004). Page 211.AucasaurusA. garridoi Neuquén Province Anacleto Formation"Nearly complete skeleton."NeuquenornisN. volans Neuquén Province Bajo de la Carpa Formation"Partial skeleton.""Table 11.1," in Weishampel, et al. (2004). Page 213.PatagopteryxP. deferrariisi Neuquén Province Bajo de la Carpa Formation"Many skeletons.""Table 11.1," in Weishampel, et al. (2004). Page 212.VelocisaurusV. unicus Neuquén Province Bajo de la Carpa Formation"Partial hind limb."
See also List of stratigraphic units with dinosaur body fossils List of stratigraphic units with dinosaur trace fossils
References
Bibliography