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°24′S 69°06′W / 37.4°S 69.1°W |
| Approximate paleocoordinates | 42°12′S 49°24′W / 42.2°S 49.4°W |
| Region | Mendoza, Río Negro & Neuquén Provinces |
| Country |  Argentina |
| Extent | Neuquén Basin |
| Type section | |
| Named for | Neuquén River |
  Río Neuquén Subgroup (Argentina) | |
Fossil content
edit| 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
editReferences
edit- ^ Garrido, 2011, p.237
- ^ Garrido, 2011, p.236
- ^ Balgord & Carapa, 2014, p.6
- ^ Balgord, 2017, p.455
- ^ Lebinson et al., 2018, p.252
- ^ Leanza et al., 2004, p.63
- ^ Weishampel, 2004, pp. 600-604
- ^ a b c d e f g h i j k l m n "Río Neuquén Formation." Weishampel, et al. (2004). Pg. 603.
- ^ "Table 13.1," in Weishampel, et al. (2004). Page 270.
- ^ "Table 10.1," in Weishampel, et al. (2004). Page 199.
- ^ "Table 11.1," in Weishampel, et al. (2004). Page 211.
- ^ "Table 10.1," in Weishampel, et al. (2004). Page 198.
Bibliography
edit- Balgord, Elizabeth A (2017), "Triassic to Neogene evolution of the south-central Andean arc determined by detrital zircon U-Pb and Hf analysis of Neuquén Basin strata, central Argentina (34°S–40°S)", Lithosphere, 9 (3): 453–462, doi:10.1130/L546.1
- Balgord, Elizabeth A.; Carapa, Barbara (2014), "Basin evolution of Upper Cretaceous–Lower Cenozoic strata in the Malargüe fold-and-thrust belt: northern Neuquen Basin, Argentina" (PDF), Basin Research: 1–24, retrieved 2019-02-22
- Garrido, Alberto C (2011), El Grupo Neuquén (Cretácico Tardío) en la Cuenca Neuquina, XVIII Congreso Geológico Argentino, pp. 231–244, retrieved 2019-02-23
- Leanza, H.A.; Apesteguia, S.; Novas, F.E.; De la Fuente, M.S. (2004), "Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages", Cretaceous Research, 25: 61–87, Bibcode:2004CrRes..25...61L, doi:10.1016/j.cretres.2003.10.005, retrieved 2019-02-16
- Lebinson, Fernando; Turienzo, Martín; Sánchez, Natalia; Araujo, Vanesa; D'Annunzio, María Celeste; Dimieri, Luis (2018), "The structure of the northern Agrio fold and thrust belt (37°30' S), Neuquén Basin, Argentina", Andean Geology, 45 (2): 249–273, doi:10.5027/andgeoV45n2-3049, hdl:11336/83841, retrieved 2019-02-22
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21