| Río Neuquén Subgroup | |
| Type: | Subgroup |
| Period: | Coniacian |
| Age: | Late Turonian-Late Coniacian ~ |
| Prilithology: | Sandstone |
| Otherlithology: | Claystone, limestone, mudstone |
| Namedfor: | Neuquén River |
| Region: | Mendoza, Río Negro & Neuquén Provinces |
| Coordinates: | -37.4°N -69.1°W |
| Paleocoordinates: | -42.2°N -49.4°W |
| Unitof: | Neuquén Group |
| Subunits: | Plottier, Sierra Barrosa, Los Bastos & Portezuelo Formations |
| Underlies: | Río Colorado Subgroup |
| Overlies: | Río Limay Subgroup |
| Thickness: | Up to 155m (509feet) |
| Extent: | Neuquén Basin |
The Río Neuquén Subgroup is a geological subgroup in the Neuquén Basin, Neuquén Province, Argentina, whose strata date back to the Late Cretaceous. The subgroup, formerly defined as a formation, is the middle unit of the Neuquén Group and contains the Plottier, Sierra Barrosa Formation,[1] Los Bastos Formation,[2] and Portezuelo Formations.[3] [4] [5] The subgroup overlies the Río Limay Subgroup and is overlain by the Río Colorado Subgroup.[6] Dinosaur remains are among the fossils that have been recovered from the formation.[7]
| Dinosaurs | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Antarctosaurus[8] | A. giganteus | "[Two] femora, pubis."[9] | Río Neuquén remains previously referred to A. giganteus are now attributed to an indeterminate sauropod. | |||
| A. wichmannianus | ||||||
| Megaraptor | M. namunhuaiquii | "Partial forelimb, manus, and pes."[10] | ||||
| Patagonykus | P. puertai | "Partial postcranial skeleton."[11] | ||||
| Rinconsaurus | R. cadamirus | |||||
| Titanosaurus | Indeterminate | Titanosaurus is now considered a nomen dubium. | ||||
| Unenlagia | U. comahuensis | "Fragmentary postcrania."[12] | ||||