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Geological subgroup in Argentina From Wikipedia, the free encyclopedia
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 ~ | |
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 |
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] | ||||
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