Chorrillo Formation
The Chorrillo Formation, also named as Chorillo Formation,[1] 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.[2]
| Chorrillo Formation | |
|---|---|
| Stratigraphic range: | |
 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 | 49.9°S 72.5°W |
| Approximate paleocoordinates | 51.8°S 62.2°W |
| 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
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
References
- Río Leona at Fossilworks.org
- Marenssi et al., 2003, p.406
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. Bibcode:2020SciNa.107...49C. doi:10.1007/s00114-020-01705-x. PMID 33211174. S2CID 227066248. 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. Bibcode:2021CrRes.12504881R. doi:10.1016/j.cretres.2021.104881. 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. Bibcode:2022NatSR..12.6318A. doi:10.1038/s41598-022-09272-z. PMC 9042913. PMID 35474310.
- 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. S2CID 254804249. 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
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