Malargüe Group

Malargüe Group
Stratigraphic range: Early Maastrichtian-Deseadan
~79–30 Ma

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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	40.0°S 66.6°W
Approximate paleocoordinates	42.8°S 52.2°W
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

Fossils of dinosaurs, plesiosaurs, turtles (Euclastes,[7] Mendozachelys wichmanni),[8] Paleoanculosa sp.,[9] fish,[10] birds (cf. Andrewsornis sp.)[11] and mammals have been recovered from the strata that make up the Malargüe Group.[12]

Archaeohyrax suniensis, Argyrohyrax proavus, Asmodeus petrasnerus, Fieratherium sorex, Gualta cuyana, Hegetotheriopsis sulcatus, Mendozahippus fierensis, Meteutatus aff. lagenaformis, Proborhyaena gigantea, Prohegetotherium malalhuense, P. schiaffinoi, P. cf. sculptum, Propachyrucos cf. smithwoodwardi, ?Prozaedyus aff. impressus, Pyrotherium romeroi, Stenotatus aff. ornatus, Trachytherus cf. spegazzinianus, cf. Archaeotypotherium sp., Pharsophorus sp., Proadinotherium sp., Progaleopithecus sp., cf. Prosotherium sp., Acaremyidae indet., Glyptodontidae indet., Interatheriidae indet., Litopterna indet., ?Megalonychidae indet., Notohippidae indet., Toxodontidae indet.[11][13][14][15]

gollark: hd!histodev

gollark: Idea: rename macros to macrons.

gollark: What if we make a binary asm2bf encoding and a direct asm2bf interpreter?

gollark: Idea: combine BF and lambda calculus.

gollark: Isn't that more mergesort?

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
Quebrada Fiera at Fossilworks.org
Weishampel et al., 2004
Cerdeño & Reguero, 2015
Seoane & Cerdeño, 2014
Cerdeño & Vera, 2014

De la Fuente, M.S.; I. Maniel; J.M. Janello; J. Sterli; B.G. Riga, and F. Novas. 2017. A new large panchelid turtle (Pleurodira) from the Loncoche Formation (upper Campanian-lower Maastrichtian) of the Mendoza Province (Argentina): Morphological, osteohistological studies, and a preliminary phylogenetic analysis. Cretaceous Research 69. 147–168. Accessed 2019-02-21.
González Riga, B.J. 1999. Hallazgo de vertebrados fósiles en la Formación Loncoche, Cretácico Superior de la provincia de Mendoza, Argentina. Ameghiniana 36. 401–410.
Leanza, H.A.; S. Apesteguia; F.E. Novas, and M.S. De la Fuente. 2004. Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages. Cretaceous Research 25. 61–87. Accessed 2019-02-16.
Previtera, E., and B.J. González Riga. 2008. Vertebrados cretácicos de la Formación Loncoche en Calmu-Co, Mendoza, Argentina (Cretaceous vertebrates from the Loncoche Formation in Calmu-Co, Mendoza, Argentina). Ameghiniana 45. 349–359. Accessed 2019-02-21.
Weishampel, David B.; Peter Dodson, and Halszka (eds.) Osmólska. 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21.ISBN 0-520-24209-2

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