Geologic formation in Patagonia, Argentina
Non-avian dinosaurs named from the 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]
Dinosaur remains are among the fossils that have been recovered from the formation.
Fossils recovered from the formation are:
Color key Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
Sauropods of the Chorrillo Formation Genus Species Locality Material Notes Images Nullotitan [ 3] N. glaciaris Estancia Alta Vista A partial skeleton consisting of a third cervical vertebra, tail vertebrae, a neck rib, ribs, a left shoulder blade, the ends of a right thigh bone, a right shin, a right calf bone, and a right ankle bone A colossosaurian titanosaur Titanosauria Indet.[ 3] Indeterminate[ 3] Seven isolated teeth[ 3]
Theropods of the Chorrillo Formation Genus Species Locality Material Notes Images Kookne [ 3] K. yeutensis An incomplete right coracoid lacking sternal end and proximal end damaged An ornithuran bird Maip [ 4] M. macrothorax La Anita Farm Axis, several dorsal and caudal vertebrae, cervical and dorsal ribs, gastralia, a left coracoid, fragmentary scapula, partial right pubis, and partial metatarsal The largest megaraptorid theropod of South America and possibly the largest member of this group
Megaraptoridae Indet.[ 3] Indeterminate[ 3] La Anita Farm[ 3] Isolated teeth[ 3] Noasauridae Indet.[ 3] Indeterminate[ 3] Isolated right pedal phalanx IV-2?[ 3] Unenlagiidae Indet.[ 3] Indeterminate[ 3] An isolated dorsal vertebrae, pedal ungual of digit II and phalanx III-2[ 3] Yatenavis [ 5] Y. ieujensis Estancia La Anita. Distal right humerus An enantiornithine bird
Thyreophorans of the Chorrillo Formation Genus Species Locality Material Notes Images Parankylosauria Indet.[ 6] Indeterminate Five fragmentary caudal vertebrae, incomplete ribs, two incomplete humeri, and nine osteoderms[ 7]
Amphibians of the Chorrillo Formation Genus Species Locality Material Notes Images Anura Indet. Indeterminate Isolated tibiofibula Calyptocephalella C. gayi Incomplete left maxilla, incomplete right maxilla, incomplete right ilium, proximal right radioulna, left proximal end of tibiofibula and proximal half of urostyle Calyptocephalellidae Indet. Indeterminate A distal end of right humerus Pipoidea Indet. Indeterminate Distal end of right humerus
Fishes of the Chorrillo Formation Genus Species Locality Material Notes Images Lamniformes Indet. Indeterminate Isolated upper lateral tooth Teleostei Indet. Indeterminate Three crushing tooth crowns Vidalamiinae Indet. Indeterminate Isolated tooth A amiid fish
Mammals of the Chorrillo Formation Genus Species Locality Material Notes Images Magallanodon [ 8] M. baikashkenke Río de Las Chinas Valley and La Anita Farm Tentative first upper molariform, anterior end of a left dentary bearing part of its gliriform incisor, and upper mesial incisor from the right side A ferugliotheriid gondwanathere Mammalia Indet. Indeterminate Two isolated caudal vertebrae Patagorhynchus [ 9] P. pascuali La Anita Farm Lower right molar attached to a fragment of the dentary A ornithorhynchid monotreme Patagomaia [ 10] P. chainko La Anita Farm Partial left acetabulum and ischium A large therian
Mosasaurs of the Chorrillo Formation Genus Species Locality Material Notes Images Mosasauridae Indeterminate
Turtles of the Chorrillo Formation Genus Species Locality Material Notes Images Chelidae Indet. Indeterminate Hydromedusinae Indet. Indeterminate Left peripheral 3 or 4, bridge peripheral, fragment indet; bridge peripheral, right hypoplastron, buttress, plastral fragment and ?plastral fragment Meiolaniformes Indet. Indeterminate Distal end of a left humerus
Plants of the Chorrillo Formation Genus Species Locality Material Notes Images Podocarpoxylon P. dusenii
Algaes of the Chorrillo Formation Genus Species Locality Material Notes Images Sphaeroplea [ 14] S. striatocristata
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"A large Megaraptoridae (Theropoda: Coelurosauria) from Upper Cretaceous (Maastrichtian) of Patagonia, Argentina" . Scientific Reports . 12 (1) 6318. Bibcode :2022NatSR..12.6318A . doi :10.1038/s41598-022-09272-z . PMC 9042913 . PMID 35474310 . ^ Herrera, Gerardo Álvarez; Agnolín, Federico; Rozadilla, Sebastián; Lo Coco, Gastón E.; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (2022-12-16). "New enantiornithine bird from the uppermost Cretaceous (Maastrichtian) of southern Patagonia, Argentina" . Cretaceous Research . 144 105452. doi :10.1016/j.cretres.2022.105452 . ISSN 0195-6671 . S2CID 254804249 . ^ Perez Loinaze, Valeria S.; Vera, Ezequiel I.; Raigemborn, M. Sol; Moyano-Paz, Damián; Santamarina, Patricio; Agnolín, Federico; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (2025-01-25). "Palynofloras from the Maastrichtian Chorrillo Formation (Patagonia, Argentina): Paleoenvironmental and paleoclimatic implications" . 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: CS1 maint: publisher location (link ) 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 . hdl :11336/122229 . 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 . 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