Río Neuquén Subgroup

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]

Río Neuquén Subgroup Stratigraphic range: Late Turonian-Late Coniacian ~91–86 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 / -37.4; -69.1
Approximate paleocoordinates	42.2°S 49.4°W / -42.2; -49.4
Region	Mendoza, Río Negro & Neuquén Provinces
Country	Argentina
Extent	Neuquén Basin
Type section
Named for	Neuquén River
Río Neuquén Subgroup (Argentina)