Chorrillo Formation

Chorrillo Formation Stratigraphic range: Maastrichtian PreꞒ Ꞓ 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
Overlies	La Irene Formation
Thickness	>50 m (160 ft)
Lithology
Primary	Claystone
Location
Location	Patagonia
Coordinates	49°54′S 72°30′W / 49.9°S 72.5°W / -49.9; -72.5Coordinates: 49°54′S 72°30′W / 49.9°S 72.5°W / -49.9; -72.5
Approximate paleocoordinates	51°48′S 62°12′W / 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)

The Chorrillo Formation, also named as Chorillo Formation,^[1] is a Maastrichtian geologic formation in southern Patagonia, Argentina. The formation is more than 50 metres (160 ft) thick and underlies the and rests on top of the La Irene Formation.^[2]

Fossils[]

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

Fossils recovered from the formation are:

• Dinosaurs

  • Isasicursor
  • Nullotitan
  • 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.

  Mosasaurs

  • Mosasauridae indet.

  Snakes

  • 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

• Pollen

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.; Martinelli, A.; D'Angelo, J.; Álvarez-Herrera, J.; Gentil, A.; Bogan, S.; Chimento, N.; García-Marsà, J.; Lo Coco, G.; Miquel, S.; Brito, F.; Vera, E.; Loinaze, V.; Fernandez, M.; Salgado, L. (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. 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. 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. doi:10.1016/j.cretres.2021.104881. Retrieved 2022-02-06.

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