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.

Fossil content