Chorrillo
Description
Source: Wikipédia
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. It constitutes a significant uppermost Cretaceous continental sedimentary sequence within the Magallanes Basin, located in Santa Cruz Province, Argentina, approximately 30 km southwest of El Calafate. Initial investigations in the 1990s laid the groundwork, with detailed paleontological studies emerging since 2019, revealing a rich biotic assemblage. The formation correlates with the lower Dorotea Formation in Chile, sharing dinosaurian ecotypes, while both are clearly different from other northern Patagonian Maastrichtian units (e.g., Allen Formation, Los Alamitos Formation), which are dominated by saltasaurine sauropods and abelisaurids, suggesting potential temporal or environmental distinctions.
Découvertes
Source: The Paleobiology Database
Site(s) correspondant(s) à cette formation: 11
Río Leona (MACN) : Santa Cruz - Lago Argentino 13712 13929 41410 59060 near Lago Argentino, between it and Lake Viedma, on L (E) bank of Río Leona- La Anita (Nullo site) : Santa Cruz - Lago Argentino 13712 71193 81587 82416 Nullo site (locality 1)
- La Anita (Titanosaur tibia site) : Santa Cruz - Lago Argentino 71193 82416
- La Anita (Megaraptorid site) : Santa Cruz - Lago Argentino 71193 76842 81587 82416 85586
- La Anita (Puma cave site) : Santa Cruz - Lago Argentino 71193 81587 82416 84650 85586 88358 30 km SW of El Calafate. Reported in Moyano-Paz et al. (2022) as Magallanodon Site (collection point 227004 is a DUPLICATE)
- La Anita (Ornithopod site) : Santa Cruz - Lago Argentino 71193 82416 DUPLICATE of Isasicursor Site I 227005 in Moyano-Paz et al 2022, I have unified the occurrences
- La Anita (ankylosaur site) : Santa Cruz - Lago Argentino 76842 82416
- La Anita (Ornithopod site)- level 50m : Santa Cruz - Lago Argentino 82416
- La Anita, Isasicursor Site II : Santa Cruz - ? 82416 85586 Coordinates: 50°30'51.84"S, 72°33'18.01"W
- La Anita, Yatenavis locality : Santa Cruz - ? 82416 84655 Coordinates stated in the text and confirmed by GPS field data.
The particular site is a small spot (approximately 10 20 m) which also yielded several minute and disarticulated fossil remains of terrestrial gastropods, fishes, frogs, mammals, snakes, turtles, a sphenodont, small non-avialan dinosaurs and the present enantiornithine. Ca. 500 m from the "Puma cave site."
- Monotreme site : Santa Cruz - ? 85586 88358 84650 The specimens here reported were discovered at ‘La Anita’ farm, located approximately 30 km SW from El Calafate City, Santa Cruz Province, Argentina.
‘Monotreme site’ (S 50° 31.128´ W 72° 33.845´)
Publication(s)
La base comprend 12 publication(s).
Source: The Paleobiology Database
- ↑1 2 F. v. Huene. 1929. Los sauriquios y ornitisquios del Cretáceo argentino. Anales del Museo de La Plata, serie 2 3:1-196
- ↑1 2 3 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
- ↑1 J. F. Bonaparte and Z. B. Gasparini. 1979. Los sauropodos de los grupos Neuquén y Chubut, y sus relaciones cronologicas [The sauropods of the Neuquén and Chubut Groups, and their chronological relationships]. Actas del VII Congreso Geológico Argentino, Neuquén 2:393-406
- ↑1 P. D. Mannion and A. Otero. 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 (https://doi.org/10.1080/02724634.2012.660898)
- ↑1 2 3 4 5 6 7 8 9 F. E. Novas, F. L. Agnolin, and S. Rozadilla, A. M. Aranciaga-Rolando, F. Brisson-Egli, M. J. Motta, M. Cerroni, M. D. Ezcurra, A. G. Martinelli, J. S. D.’Angelo, G. Alvarez-Herrera. 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, Nueva Serie 21(2):217-293 (https://doi.org/10.22179/revmacn.21.655)
- ↑1 2 3 A. M. Aranciaga Rolando, M. J. Motta, and F. L. Agnolín, M. Manabe, T. Tsuihiji, F. E. Novas. 2022. A large Megaraptoridae (Theropoda: Coelurosauria) from Upper Cretaceous (Maastrichtian) of Patagonia, Argentina. Scientific Reports 12:6318:1-29 (https://doi.org/10.1038/s41598-022-09272-z)
- ↑1 2 3 4 5 6 7 8 9 10 11 D. Moyano-Paz, S. Rozadilla, and F. Agnolín, E. Verad, M. D. Coronel, A. N. Varela, A. R. Gómez-Dacal, A. M. Aranciaga-Rolando, J. D.'Angelo, V. Pérez-Loinaze, S. Richiano, N. Chimento, M. J. Motta, J. Sterli, M. Manabe, T. Tsuihiji, M. P. Isasi, D. G. Poiré, F. E. Novas. 2022. The uppermost Cretaceous continental deposits at the southern end of Patagonia, the Chorrillo Formation case study (Austral-Magallanes Basin): Sedimentology, fossil content and regional implications. Cretaceous Research 130:105059 (https://doi.org/10.1016/j.cretres.2021.105059)
- ↑1 2 3 S. Rozadilla, F. Agnolín, and M. Manabe, T. Tsuihiji, F. E. Novas. 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 (https://doi.org/10.1016/j.cretres.2021.104881)
- ↑1 2 3 4 D. Pol, E. Vlachos, and F. Aspromonte. 2023. The end of the dinosaur era in Patagonia (NatGeo Project).
- ↑1 2 N. R. Chimento, F. L. Agnolín, and M. Manabe, T. Tsuihiji, T. H. Rich, P. Vickers-Rich, F. E. Novas. 2023. First monotreme from the Late Cretaceous of South America. Communications Biology 6:146:1-6 (https://doi.org/10.1038/s42003-023-04498-7)
- ↑1 2 F. Agnolín, M. Aranciaga Rolando, and M. Manabe, T. Tsuihiji, F. E. Novas. 2024. Southernmost lepidosaur (Reptilia) assemblage from the Late Cretaceous of Patagonia. Historical Biology (https://doi.org/10.1080/08912963.2024.2341850)
- ↑1 2 G. Álvarez Herrera, F. Agnolín, and S. Rozadilla, G. E. Lo Coco, M. Manabe, T. Tsuihiji, F. E. Novas. 2023. New enantiornithine bird from the uppermost Cretaceous (Maastrichtian) of southern Patagonia, Argentina. Cretaceous Research 144:105452 (https://doi.org/10.1016/j.cretres.2022.105452)
Galerie d'image
Pas d'image.