{{Short description|Group of geologic formations in Argentina}} {{Use shortened footnotes|date=January 2023}} {{Infobox rockunit | name = Neuquén Group | period = Late Cretaceous | age = Early Cenomanian-Early Campanian<br />~{{fossilrange|98|79}} | image = Cerros colorados res.jpg | imagesize = | caption = Almost the whole extent of the Neuquén Group is exposed between Lake Los Barreales and the bend of the Neuquén River in the center of this photo.To the lower left of the lake, a swath of light yellowish sandstones of the group's Huincul Formation are visible. | type = Group | prilithology = | otherlithology = | unitof = | subunits = 8px Río Colorado Subgroup<br /> Anacleto Formation<br /> Bajo de la Carpa Formation 8px Río Neuquén Subgroup<br /> Plottier Formation<br /> Portezuelo Formation 8px Río Limay Subgroup<br /> Lisandro Formation<br /> Huincul Formation<br /> Candeleros Formation | underlies = Malargüe Group<br /> Allen Formation | overlies = Lohan Cura Formation | thickness = {{convert|500|m|ft|abbr=on}} | area = | map = {{Location map+ | Argentina | relief = 1 | width = 250 | float = center | places = {{Location map~ | Argentina<!--Anacleto--> | lat_deg = -37.9 | lon_deg = -68.5 | mark = Lightgreen pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Bajo de la Carpa--> | lat_deg = -38.8 | lon_deg = -68.8 | mark = Lightgreen pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Portezuelo--> | lat_deg = -38.5 | lon_deg = -68.7 | mark = SpringGreen pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Plottier--> | lat_deg = -37.4 | lon_deg = -69.1 | mark = SpringGreen pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Candeleros--> | lat_deg = -39.4 | lon_deg = -69.2 | mark = Green pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Huincul--> | lat_deg = -39.4 | lon_deg = -69.0 | mark = Green pog.svg | marksize = 8 }} {{Location map~ | Argentina<!--Lisandro--> | lat_deg = -34.1 | lon_deg = -68.9 | mark = Green pog.svg | marksize = 8 }} }} | map_caption = | location = | coordinates = {{coord|38.5|S|68.7|W|display=inline,title}} | paleocoordinates = {{coord|44.4|S|47.2|W|display=inline}} | region = Río Negro, Neuquén & Mendoza Provinces | country = Argentina | extent = Neuquén Basin | namedfor = Neuquén | namedby = | year_ts = }} The '''Neuquén Group''' is a group of geologic formations found in Argentina. Rocks in the Neuquén Group fall within the Cenomanian to early Campanian stages of the Late Cretaceous Period. It overlies the older Lohan Cura Formation and is itself overlain by the younger Allen Formation of the Malargüe Group, separated from both by unconformities, dated to 98 and 79 Ma respectively.<ref name="Leanza2004 p63">Leanza et al., 2004, p. 63</ref>
== Description == Deposits have been located in the provinces of Río Negro, Neuquén, and Mendoza. Although several different types of environments are represented in various sections of the Neuquén Group, the dominant regime is alluvial deposition. Many dinosaur and other fossil types have been discovered in these sediments.
=== Subdivision === There are seven formations within the Neuquén Group. These are divided into three subgroups named after major rivers in the area. In some works, the subgroups themselves are treated as formations and what usually is considered to be the formations as mere members of these. However, particularly in the Río Limay Subgroup, the formations are clearly composed of very distinct rock layers.<ref name="Sanchez etal 2006">Sánchez ''et al.'' (2006)</ref>
Neuquén Group strata, ordered from youngest to oldest * Río Colorado Subgroup (Santonian to early Campanian) ** Anacleto Formation (early Campanian) ** Bajo de la Carpa Formation (Santonian) * Río Neuquén Subgroup (late Turonian to Coniacian) ** Plottier Formation (late Coniacian ?to early Santonian) **Sierra Barrosa Formation (middle Coniacian) **Los Bastos Formation (early Coniacian) ** Portezuelo Formation (late Turonian to earliest Coniacian) **Cerro Lisandro Formation (middle Turonian) * Río Limay Subgroup (Cenomanian to early Turonian) ** Lisandro Formation (middle to late Turonian) ** Huincul Formation (late Cenomanian to early Turonian) ** Candeleros Formation (early Cenomanian)
South of Añelo, on the road between Lake Los Barreales and the Neuquén River are views on the successively younger formations, starting with the Lisandro Formation to the northwest of Lake Los Barreales, and finally crossing the Anacleto Formation about {{convert|35|km|mi}} down the road near the eastern tip of the lake. The older strata are exposed south of Lake Los Barreales.<ref name="Sanchez etal 2006" />
== See also == * List of fossil sites * Angostura Colorada Formation, Campanian to Maastrichtian fossiliferous formation of the North Patagonian Massif * Asencio Formation, Campanian to Maastrichtian fossiliferous formation of the Paraná Basin * Bajo Barreal Formation, Cenomanian to Turonian fossiliferous formation of the Golfo San Jorge Basin * Bauru Group, Coniacian to Maastrichtian fossiliferous group of the Paraná Basin * Cerro Fortaleza Formation, Cenomanian fossiliferous formation of the Austral Basin * Colorado Formation, Campanian to Maastrichtian fossiliferous formation of the Colorado Basin * Lago Colhué Huapí Formation, Campanian to Maastrichtian fossiliferous formation of the Golfo San Jorge Basin * Los Blanquitos Formation, Campanian fossiliferous formation of the Salta Basin * Mata Amarilla Formation, Albian to Santonian fossiliferous formation of the Austral Basin * Santa Marta Formation, Santonian to Campanian fossiliferous formation of northern Antarctica
== References == {{reflist|30em}}
=== Bibliography === {{commonscat|Neuquén Group}} * {{cite journal |last1=Leanza |first1=H.A. |last2=Apesteguia |first2=S. |author3-link=Fernando Novas |last3=Novas |first3=F.E. |last4=De la Fuente |first4=M.S. |year=2004 |title=Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages |url=https://www.researchgate.net/publication/257047651 |journal=Cretaceous Research |volume=25 |pages=61–87 |doi=10.1016/j.cretres.2003.10.005 |bibcode=2004CrRes..25...61L |accessdate=2019-02-16}} * {{cite journal |last1=Sánchez |first1=María Lidia |last2=Heredia |first2=Susana |last3=Calvo |first3=Jorge O. |year=2006 |title=Paleoambientes sedimentarios del Cretácico Superior de la Formación Plottier (Grupo Neuquén), Departamento Confluencia, Neuquén (Sedimentary paleoenvironments in the Upper Cretaceous Plottier Formation (Neuquen Group), Confluencia, Neuquén) |url=https://www.researchgate.net/publication/262615949 |journal=Revista de la Asociación Geológica Argentina |volume=61 |pages=3–18 |accessdate=2019-02-16}}
{{DEFAULTSORT:Neuquen Group}} Category:Neuquén Group Category:Upper Cretaceous Series of South America Category:Cretaceous Argentina Category:Mapuche language