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, Los Bastos Formation, and Portezuelo Formations. The subgroup overlies the Río Limay Subgroup and is overlain by the Río Colorado Subgroup. Dinosaur remains are among the fossils that have been recovered from the formation.
Image: Rinconsaurus test 2
Image: Unenlagia comahuensis
The Neuquén Group is a group of geologic formations found in Argentina. Rocks in the Neuquén Group fall within the Cenomanian to early Campanian stages of the Late Cretaceous Period. It overlies the older Lohan Cura Formation and is itself overlain by the younger Allen Formation of the Malargüe Group, separated from both by unconformities, dated to 98 and 79 Ma respectively.
Almost the whole extent of the Neuquén Group is exposed between Lake Los Barreales and the bend of the Neuquén River in the center of this photo.To the lower left of the lake, a swath of light yellowish sandstones of the group's Huincul Formation are visible.
