Malargüe Group

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]

Malargüe Group
Stratigraphic range: Early Maastrichtian-Deseadan
~79–30 Ma
Outcrop of the Allen Formation at Auca Mahuida
TypeGroup
Sub-units Agua de la Piedra Formation
Roca & Jagüel Formations
Loncoche & Allen Formations
OverliesNeuquén Group
 Río Colorado Subgroup
  Anacleto Formation
Lithology
PrimaryMudstone, sandstone, conglomerate
OtherLimestone, tuff, paleosol
Location
Coordinates40.0°S 66.6°W / -40.0; -66.6
Approximate paleocoordinates42.8°S 52.2°W / -42.8; -52.2
RegionLa Pampa, Río Negro, Neuquén & Mendoza Provinces
Country Argentina
ExtentNeuquén Basin
Type section
Named forMalargüe
Malargüe Group (Argentina)

Subdivision

The Malargüe Group is subdivided into:

Fossil content

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]

Mammals of the Agua de la Piedra Formation

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]

See also

References

  1. Leanza et al., 2004, p.63
  2. Rodríguez, María Fernanda (2011). "El grupo Malargüe (Cretácico Tardío-Paleógeno Temprano) en la Cuenca Neuquina". Relatorio del XVIII Congreso Geológico Argentino: 245–264.
  3. Agua de la Piedra Formation at Fossilworks.org
  4. Roca Formation at Fossilworks.org
  5. Jagüel Formation at Fossilworks.org
  6. Loncoche Formation at Fossilworks.org
  7. Euclastes at Fossilworks.org
  8. De la Fuente et al., 2017
  9. Previtera & González Riga, 2008
  10. Gónzalez Riga, 1999
  11. Quebrada Fiera at Fossilworks.org
  12. Weishampel et al., 2004
  13. Cerdeño & Reguero, 2015
  14. Seoane & Cerdeño, 2014
  15. Cerdeño & Vera, 2014

Bibliography

Cretaceous
Paleogene
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