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)

Fossil content

See also: Plottier Formation § Fossil content, and Portezuelo Formation § 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]

See also

• List of dinosaur-bearing rock formations