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Malargüe Group - Wikipedia

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Malargüe Group
Stratigraphic range: Early Maastrichtian-Deseadan ~79–30 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Outcrop of the Allen Formation at Auca Mahuida
Type	Group
Sub-units	Agua de la Piedra Formation Roca & Jagüel Formations Loncoche & Allen Formations
Overlies	Neuquén Group Río Colorado Subgroup Anacleto Formation
Lithology
Primary	Mudstone, sandstone, conglomerate
Other	Limestone, tuff, paleosol
Location
Coordinates	40°00′S 66°36′W / 40.0°S 66.6°W / -40.0; -66.6
Approximate paleocoordinates	42°48′S 52°12′W / 42.8°S 52.2°W / -42.8; -52.2
Region	La Pampa, Río Negro, Neuquén & Mendoza Provinces
Country	Argentina
Extent	Neuquén Basin
Type section
Named for	Malargüe
Malargüe Group (Argentina)

The Malargüe Group is a group of geologic formations of the Neuquén Basin of the Mendoza, Neuquén, Río Negro and La Pampa Provinces in northern Patagonia, Argentina. The formations of the Malargüe Group range in age between the middle Campanian to Deseadan, an Oligocene age of the SALMA classification, straddling the Cretaceous–Paleogene boundary, about 79 million to 30 million years in age. The group overlies the older Neuquén Group, separated by an unconformity dated to 79 Ma.^[1] The rocks of the Malargüe Group comprise both marine and continental deposits which are over 400 m (1312 ft) thick in total.^[2]

Subdivision

The Malargüe Group is subdivided into:

Agua de la Piedra Formation (Deseadan) - white-grayish tuffs and tobaceous paleosols^[3]
Roca Formation (Maastrichtian to Danian) - coastal mudstones and sandstones^[4]
Jagüel Formation (middle Maastrichtian to Danian) - shallow marine mudstones^[5]
Loncoche Formation (late Campanian to early Maastrichtian) - terrestrial conglomerates and sandstones, delta plain sandstones and limestones^[6]
Allen Formation (middle Campanian to early Maastrichtian) - eolian sandstones and fluvio-lacustrine mudstones and limestones

^ Leanza et al., 2004, p.63
^ Rodríguez, María Fernanda (2011). "El grupo Malargüe (Cretácico Tardío-Paleógeno Temprano) en la Cuenca Neuquina". Relatorio del XVIII Congreso Geológico Argentino: 245–264.
^ Agua de la Piedra Formation at Fossilworks.org
^ Roca Formation at Fossilworks.org
^ Jagüel Formation at Fossilworks.org
^ Loncoche Formation at Fossilworks.org
^ Euclastes at Fossilworks.org
^ De la Fuente et al., 2017
^ Previtera & González Riga, 2008
^ Gónzalez Riga, 1999
^ ^a ^b Quebrada Fiera at Fossilworks.org
^ Weishampel et al., 2004
^ Cerdeño & Reguero, 2015
^ Seoane & Cerdeño, 2014
^ Cerdeño & Vera, 2014

Cerdeño, Esperanza; Reguero, Marcelo (2015), "The Hegetotheriidae (Mammalia, Notoungulata) assemblage from the late Oligocene of Mendoza, central-western Argentina", Journal of Vertebrate Paleontology, 35 (2): e907173, Bibcode:2015JVPal..35E7173C, doi:10.1080/02724634.2014.907173, hdl:11336/48566, retrieved 2015-02-13
Cerdeño, Esperanza; Vera, Bárbara (2014), "A new Leontiniidae (Notoungulata) from the Late Oligocene beds of Mendoza Province, Argentina", Journal of Systematic Palaeontology, 13 (11): 943–962, doi:10.1080/14772019.2014.982727, hdl:11336/59428, retrieved 2019-02-12
Combina, Ana María; Nullo, Francisco (2011), "Ciclos tectónicos, volcánicos y sedimentarios del Cenozoico del sur de Mendoza-Argentina (35-37° S y 69° 30'W)" (PDF), Andean Geology, 38: 198–218, retrieved 2018-09-11
Hernández Del Pino, Santiago; Seoane, Federico D.; Cerdeño, Esperanza (2017), "New postcranial remains of large toxodontian notoungulates from the late Oligocene of Mendoza, Argentina and their systematic implications" (PDF), Acta Palaeontologica Polonica, 62: 195–210, retrieved 2019-02-12
Seoane, Federico; Cerdeño, Esperanza (2014), "First extra-Patagonian record of Asmodeus Ameghino (Notoungulata, Homalodotheriidae) in the Late Oligocene of Mendoza Province, Argentina", Ameghiniana, 51 (5): 373–384, doi:10.5710/AMGH.07.07.2014.2735, retrieved 2019-02-12