Río Neuquén Subgroup
Geological subgroup in Argentina
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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]
TypeSubgroup
Unit ofNeuquén Group
Sub-unitsPlottier, Sierra Barrosa, Los Bastos & Portezuelo Formations
UnderliesRío Colorado Subgroup
| Río Neuquén Subgroup | |
|---|---|
| Stratigraphic range: Late Turonian-Late Coniacian ~ | |
| Type | Subgroup |
| Unit of | Neuquén Group |
| Sub-units | Plottier, Sierra Barrosa, Los Bastos & Portezuelo Formations |
| Underlies | Río Colorado Subgroup |
| Overlies | Río Limay Subgroup |
| Thickness | Up to 155 m (509 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Claystone, limestone, mudstone |
| Location | |
| Coordinates | 37.4°S 69.1°W |
| Approximate paleocoordinates | 42.2°S 49.4°W |
| Region | Mendoza, Río Negro & Neuquén Provinces |
| Country | Argentina |
| Extent | Neuquén Basin |
| Type section | |
| Named for | Neuquén River |
  Río Neuquén Subgroup (Argentina) | |
Fossil content
| Dinosaurs | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Antarctosaurus[8] | A. giganteus[8] | "[Two] femora, pubis."[9] | Río Neuquén remains previously referred to A. giganteus are now attributed to an indeterminate sauropod.[8] | |||
| A. wichmannianus[8] | ||||||
| Megaraptor[8] | M. namunhuaiquii[8] | "Partial forelimb, manus, and pes."[10] | ||||
| Patagonykus[8] | P. puertai[8] | "Partial postcranial skeleton."[11] | ||||
| Rinconsaurus[8] | R. cadamirus[8] |  | ||||
| Titanosaurus[8] | Indeterminate[8] | Titanosaurus is now considered a nomen dubium.[citation needed] | ||||
| Unenlagia[8] | U. comahuensis[8] | "Fragmentary postcrania."[12] |  | |||