Lago Colhué Huapí Formation

Lago Colhué Huapí Formation
Lago Colhué Huapí Formation
Stratigraphic range: Campanian-Maastrichtian; ~80–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Chubut Group
Underlies	Laguna Palacios Formation and Río Chico Group (Salamanca Formation)
Overlies	Bajo Barreal Formation
Lithology
Primary	Tuff
Other	Sandstone
Location
Coordinates	45°36′S 68°30′W / 45.6°S 68.5°W
Approximate paleocoordinates	48°12′S 55°12′W / 48.2°S 55.2°W
Region	Central Patagonia
Country	Argentina
Extent	Golfo San Jorge Basin
Type section
Named for	Lake Colhué Huapí
	Lago Colhué Huapí Formation (Argentina)

The Lago Colhué Huapí Formation is a Late Cretaceous geologic formation of the Chubut Group in the Golfo San Jorge Basin in Patagonia, Argentina. The formation, named after Lake Colhué Huapí, is overlain by the Salamanca Formation of the Río Chico Group and in some areas by the Laguna Palacios Formation.^[1]

The strata of the Lago Colhué Huapé Formation were thought to pertain to the Bajo Barreal Formation, but are now recognized as a distinct stratigraphic unit in their own right.^[1]^[2]

Vertebrate paleofauna

Taxa recovered from the Lago Colhué Huapí Formation include the sauropods Aeolosaurus, and Argyrosaurus, as well as the hadrosaurid Secernosaurus and the probable elasmarian ornithopod Sektensaurus.^[3]^[4]^[5] The dubious possible ceratopsian Notoceratops was also present. The apex predator was an unnamed megaraptorid.^[1]

Dinosaurs

Ornithischians

Ornithopods reported from the Lago Colhué Huapí Formation
Genus	Species	Locality	Stratigraphic position	Material	Notes	Images
Notoceratops	N. bonarelli		Uppper.	An incomplete, toothless left dentary.	A dubious specimen that belongs to a ceratopsian family.
Secernosaurus	S. koerneri	Rio Chico	Upper	A partial skeleton.	A Saurolophinae hadrosaur.
Sektensaurus	S. sanjuanboscoi	Ephemeral island.	Upper	An associated partial skeleton.	An elasmarian ornithopod.

Sauropods

Sauropods reported from the Lago Colhué Huapí Formation
Genus	Species	Locality	Stratigraphic position	Material	Notes	Images
Aeolosaurus	A. colhuehuapensis	Ephemeral island.	Upper	A partial skeleton	A titanosaur.
Argyrosaurus	A. superbus	La Angostura, Río Chico.	Upper	A set of limb elements (left forelimb).	A titanosaur.
Elaltitan	E. lilloi	Río Senguerr bend	Lower	A partial skeleton.	A titanosaur.

Reptiles

Reptiles reported from the Lago Colhué Huapí Formation
Genus	Species	Locality	Stratigraphic position	Material	Notes	Images
Colhuehuapisuchus	C. lunai	Ephemeral island	Upper.	A mandible (Anterior portion of mandibles).	A peirosaurid notosuchian.

References

^ ^a ^b ^c Casal et al., 2015
^ Clyde et al., 2014
^ Martínez et al., 2016
^ Casal et al., 2007
^ Mannion & Otero, 2012

Bibliography

Casal, Gabriel A.; Allard, José O.; Foix, Nicolás (2015), "Análisis estratigráfico y paleontológico del Cretácico Superior en la Cuenca del Golfo San Jorge: Nueva unidad litoestratigráfica para el Grupo Chubut", Revista de la Asociación Geológica Argentina, 72: 77–95, retrieved 2019-02-16^{[permanent dead link‍]}
Casal, G.; Martínez, R.D.; Luna, M.; Sciutto, J. C.; Lamanna, M. (2007), "Aeolosaurus colhuehuapensis sp. nov. (Sauropoda, Titanosauria) de la Formación Bajo Barreal, Cretácico Superior de Argentina" [Aeolosaurus colhuehuapensis sp. nov. (Sauropoda, Titanosauria) from the Bajo Barreal Formation, Upper Cretaceous of Argentina], Revista Brasileira de Paleontologia, 10 (1): 53–62, doi:10.4072/rbp.2007.1.05, retrieved 2019-02-23
Clyde, W.C.; Wilf, P.; Slingerland, Iglesias A.; Barnum, T.; Bijl, P.K. (2014), "New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: implications for Cretaceous—Paleogene extinction recovery and land mammal age correlations", Geological Society of America Bulletin, 126 (3–4): 289–306, Bibcode:2014GSAB..126..289C, doi:10.1130/B30915.1, hdl:11336/80135, retrieved 2019-02-23
Cortés, José María (1986), Estratigrafía y tectónica de la región central de la Provincia de Chubut, República Argentina (PhD thesis) (PDF), Universidad de Buenos Aires, pp. 1–242, retrieved 2019-02-16
Mannion, P.D.; Otero, A. (2012), "A reappraisal of the Late Cretaceous Argentinean sauropod dinosaur Argyrosaurus superbus, with a description of a new titanosaur genus", Journal of Vertebrate Paleontology, 32 (3): 614–638, doi:10.1080/02724634.2012.660898, hdl:11336/197194, retrieved 2019-02-23
Martínez, R.D.F.; Lamanna, M.C.; Novas, F.E.; Ridgely, R.C.; Casal, G.A.; Martínez, J.E. (2016), "A Basal Lithostrotian Titanosaur (Dinosauria: Sauropoda) with a Complete Skull: Implications for the Evolution and Paleobiology of Titanosauria", PLoS ONE, 11 (4): e0151661, Bibcode:2016PLoSO..1151661M, doi:10.1371/journal.pone.0151661, PMC 4846048, PMID 27115989
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

[Casal2015-1] Casal et al., 2015

[Clyde2014-2] Clyde et al., 2014

[Martinez2016-3] Martínez et al., 2016

[Casal2007-4] Casal et al., 2007

[Mannion2012-5] Mannion & Otero, 2012

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