Earth:Chorrillo Formation

Chorrillo Formation Stratigraphic range: Maastrichtian PreЄ Є O S D C P T J K Pg N
Satellite image of the Chorrillo Formation site (in the middle on the right). In the bottom left is the Perito Moreno Glacier.
Type	Geological formation
Underlies	Calafate Formation
Overlies	La Irene Formation
Thickness	>50 m (160 ft)
Lithology
Primary	Claystone
Location
Location	Patagonia
Coordinates
Paleocoordinates	[ ⚑ ] 51.8°S 62.2°W / -51.8; -62.2
Region	Santa Cruz Province
Country	Argentina
Extent	Southeast of Viedma Lake North of Argentino Lake Austral Basin
Type section
Named by	Arbe & Hechem
Year defined	1984
Chorrillo Formation (Argentina)

Dinosaurs named from the Chorrillo Formation

The Chorrillo Formation, also named as Chorillo Formation, is a Maastrichtian (Late Cretaceous Epoch, 72.1 - 66 million years ago) geologic formation in southern Patagonia, Argentina . The formation is more than 50 metres (160 ft) thick and underlies the Calafate Formation and rests on top of the La Irene Formation.

Fossils

Dinosaur remains are among the fossils that have been recovered from the formation.

Fossils recovered from the formation are:

• Dinosaurs

  • Isasicursor
  • Nullotitan
  • Maip
  • Kookne
  • Yatenavis
  • Ankylosauria indet.
  • Euiguanodontia indet.
  • Hadrosauridae indet.
  • Megaraptoridae indet.
  • Noasauridae indet.
  • Unenlagiidae indet.

  Anurans

  • Anura indet.
  • Calyptocephalellidae indet

  Fishes

  • Teleostei indet.
  • Vidalamiinae indet.

  Mammals

  • Magallanodon
  • Mammalia indet.
  • Patagorhynchus

  Mosasaurs

  • Mosasauridae indet.

  Snakes

  • Rionegrophis
  • Serpentes indet.

  Turtles

  • Chelidae indet.

Other fossils recovered from the formation are:

Gastropods

• Pomacea sp.
• Pleuroceridae indet.
• Potamolithus sp.
• Physa sp.
• Stenophysa sp.
• Achatinidae indet.
• Holospira sp.
• Bulimulidae indet.

• Plants

• • Podocarpoxylon dusenii

• Pollen

• • Baculatisporites comaumensis
  • Baculatisporites kachaikensis
  • Ceratosporites equalis
  • Clavifera triplex
  • Clavatipollenites sp.
  • Concavissimisporites sp.
  • Cyatheacidites annulatus
  • Cyathidites australis
  • Cyathidites minor
  • Cyathidites rafaeli
  • Foveosporites canalis
  • Gleicheniidites senonicus
  • Laevigatosporites ovatus
  • Leptolepidites sp. cf. L. major
  • Microcachryidites antarcticus
  • Peninsulapollis gilli
  • Phyllocladidites mawsonii
  • Podocarpidites sp. cf. P. ellipticus
  • Podocarpidites sp. cf. P. herbstii
  • Podocarpidites sp.
  • Retitriletes austroclavatidites
  • Trichotomosulcites subgranulatus
  • Tricolpites reticulatus
  • Tricolpites sp.
  • Trilites fasolae
  • Trilites sp. cf. T. tuberculiformis
  • Trilites sp. cf. T parvallatus
  • Tuberculatosporites parvus
  • Vitreisporites signatus

See also

• List of dinosaur-bearing rock formations

References

Bibliography

• Marenssi, Sergio A.; Silvio Casadío, and Sergio N. Santillana. 2003. Estratigrafía y sedimentología de las unidades del Cretácico superior-Paleógeno aflorantes en la margen sureste del lago Viedma, provincia de Santa Cruz, Argentina. Revista de la Asociación Geológica Argentina 58. 403–416. Accessed 2018-08-30.
• Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21.ISBN:0-520-24209-2
• Novas, F.; Agnolin, F.; Rozadilla, S.; Aranciaga-Rolando, A.; Brissón-Eli, F.; Motta, M.; Cerroni, M.; Ezcurra, M. et al. (2019). "Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina.". Revista del Museo Argentino de Ciencias Naturales 21 (2): 217–293. doi:10.22179/REVMACN.21.655. http://revista.macn.gob.ar/ojs/index.php/RevMus/article/view/655/537. Retrieved 2021-01-05. 
• Chimento, N.; Agnolin, F.; Tsuihiji, T.; Manabe, M.; Novas, F. (2020). "New record of a Mesozoic gondwanatherian mammaliaform from Southern Patagonia". The Science of Nature 107 (6): 49. doi:10.1007/s00114-020-01705-x. PMID 33211174. Bibcode: 2020SciNa.107...49C. https://link.springer.com/article/10.1007/s00114-020-01705-x. Retrieved 2021-01-05. 
• Rozadilla, S.; Novas, F.; Agnolin, F.; Manabe, M.; Tsuihiji, T. (2021). "Ornithischian remains from the Chorrillo Formation (Upper Cretaceous), southern Patagonia, Argentina, and their implications on ornithischian paleobiogeography in the Southern Hemisphere". Cretaceous Research 125: 104881. doi:10.1016/j.cretres.2021.104881. Bibcode: 2021CrRes.12504881R. https://www.sciencedirect.com/science/article/abs/pii/S0195667121001282. Retrieved 2022-02-06. 
• Rolando, Alexis M. A.; Motta, Matias J.; Agnolín, Federico L; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (2022). "A large Megaraptoridae (Theropoda: Coelurosauria) from Upper Cretaceous (Maastrichtian) of Patagonia, Argentina". Scientific Reports 12 (6318): 6318. doi:10.1038/s41598-022-09272-z. PMID 35474310. Bibcode: 2022NatSR..12.6318A. 
• Herrera, Gerardo Álvarez; Agnolín, Federico J.; Rozadilla, Sebastián; Lo Coco, Gastón E.; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (2022). "New enantiornithine bird from the uppermost Cretaceous (Maastrichtian) of southern Patagonia, Argentina". Cretaceous Research 144 (105452): 105452. doi:10.1016/j.cretres.2022.105452. https://www.sciencedirect.com/science/article/abs/pii/S0195667122003160. Retrieved 2023-01-29. 

Further reading

• J. E. Powell. 2003. Revision of South American titanosaurid dinosaurs: palaeobiological, palaeobiogeographical and phylogenetic aspects. Records of the Queen Victoria Museum Launceston 111:1-173