Coordinates: 45°36′S 68°30′W / 45.6°S 68.5°W / -45.6; -68.5

Lago Colhué Huapí Formation

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Lago Colhué Huapí Formation
Stratigraphic range: Campanian-Maastrichtian
~80–66 Ma
TypeGeological formation
Unit ofChubut Group
UnderliesLaguna Palacios Formation and Río Chico Group (Salamanca Formation)
OverliesBajo Barreal Formation
Lithology
PrimaryTuff
OtherSandstone
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionCentral Patagonia
CountryArgentina
ExtentGolfo San Jorge Basin
Type section
Named forLake Colhué Huapí

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] The upper part of the Lago Colhué Huapí Formation has been dated to the upper Maastrichtian age of the late Cretaceous period.[3][4] A basalt flow in the formation has been dated to 67.31 ± 0.55 million years ago, reinforcing the Late Maastrichtian age.[5]

Vertebrate paleofauna

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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. The dubious ornithischian Notoceratops was also present.[6][7][8][1]

Dinosaurs

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ornithischians

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Ornithopods from the Lago Colhué Huapí Formation
Genus Species Locality Stratigraphic position Material Notes Images
Notoceratops N. bonarellii Upper An incomplete, toothless left dentary A dubious genasaurian ornithischian[9]
File:Secernosaurus koerneri.png
Secernosaurus
Secernosaurus S. koerneri Rio Chico Upper A partial skeleton A saurolophine hadrosaur
Sektensaurus S. sanjuanboscoi An ephemeral island Upper An associated partial skeleton An elasmarian ornithopod

Sauropods

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Sauropods from the Lago Colhué Huapí Formation
Genus Species Locality Stratigraphic position Material Notes Images
Aeolosaurus A. colhuehuapensis An ephemeral island Upper A partial skeleton A titanosaur
File:Aeolosaurus-rionegrinus-JD-2020-1.png
Aeolosaurus
File:Argyrosaurus superbus.jpg
Argyrosaurus
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
Lithostrotia indet.[10] Indeterminate Middle A partial skeleton A titanosaur

Theropods

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Theropods from the Lago Colhué Huapí Formation
Genus Species Locality Stratigraphic position Material Notes Images
Joaquinraptor[11] J. casali Valle Joaquín Upper A partial skeleton including skull bones, vertebrae, the pectoral girdle, and forelimb and hindlimb bones A megaraptorid theropod
File:Joaquinraptor casali.png
Joaquinraptor
Theropoda indet.[12] Indeterminate An ephemeral island, Mocha Peninsula Upper A manual ungual (hand claw) and possible metatarsal III A possible megaraptoran theropod

Other reptiles

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

Fish

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Fishes from the Lago Colhué Huapí Formation
Genus Species Locality Stratigraphic position Material Notes Images
Metaceratodus[13] M. kaopen Upper A ceratodontid lungfish

See also

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References

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  1. ^ a b c Casal, Allard & Foix 2015.
  2. ^ Clyde et al. 2014.
  3. ^ Vallati, De Sosa Tomas & Casal 2020.
  4. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ Martínez et al. 2016.
  7. ^ Casal 2007.
  8. ^ Mannion & Otero 2012.
  9. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).

Bibliography

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  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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