Geologic formation in southern 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:
Taxon Species Locality Stratigraphic position Material Notes Images Ankylosauria [ 3] Indeterminate Five fragmentary caudal vertebrae, incomplete ribs, two incomplete humeri, and nine osteoderms Euiguanodontia [ 4] Indeterminate Proximal end of a femur Hadrosauridae [ 5] Indeterminate Two incomplete caudal centra Isasicursor [ 6] I. santacrucensis Multiple specimens including teeth, several vertebrae, humerus, thigh bones, shoulder blades, and limbs An elasmarian ornithopod
Sauropods Taxon Species Locality Stratigraphic position Material Notes Images Nullotitan [ 6] 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 lithostrotian titanosaur Titanosauria Indeterminate Seven isolated teeth
Theropods Taxon Species Locality Stratigraphic position Material Notes Images Kookne [ 6] K. yeutensis An incomplete right coracoid lacking sternal end and proximal end damaged An avialan theropod , possibly member of Neornithes Maip [ 7] 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 Indeterminate La Anita Farm Isolated teeth Noasauridae Indeterminate Isolated right pedal phalanx IV-2? Unenlagiidae Indeterminate An isolated dorsal vertebrae, pedal ungual of digit II and phalanx III-2 Yatenavis [ 8] Y. ieujensis Estancia La Anita. Distal right humerus An enantiornithine bird
Taxon Species Locality Stratigraphic position Material Notes Images Anura Indeterminate Isolated tibiofibula Calyptocephalella C. sp. Incomplete left maxilla, incomplete right maxilla, incomplete right ilium, proximal right radioulna, left proximal end of tibiofibula and proximal half of urostyle Calyptocephalellidae Indeterminate A distal end of right humerus Pipoidea Indeterminate Distal end of right humerus
Taxon Species Locality Stratigraphic position Material Notes Images Lamniformes Indeterminate Isolated upper lateral tooth Teleostei Indeterminate Three crushing tooth crowns cf. Vidalamiinae Indeterminate Isolated tooth
Taxon Species Locality Stratigraphic position Material Notes Images Magallanodon [ 9] 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 gondwanathere Mammalia Indeterminate Two isolated caudal vertebrae Patagorhynchus [ 10] P. pascuali La Anita Farm Lower right molar attached to a fragment of the dentary A monotreme
Patagomaia [ 11] P. chainko La Anita Farm Partial left acetabulum and ischium A large therian
Taxon Species Locality Stratigraphic position Material Notes Images Mosasauridae Indeterminate
Taxon Species Locality Stratigraphic position Material Notes Images Rionegrophis cf. R. madtsoioides A partial vertebra. Serpentes Indeterminate Partial mid-posterior vertebrae
Taxon Species Locality Stratigraphic position Material Notes Images Chelidae Indeterminate Hydromedusinae Indeterminate Left peripheral 3 or 4, bridge peripheral, fragment indet; bridge peripheral, right hypoplastron, buttress, plastral fragment and ?plastral fragment Meiolaniformes Indeterminate Distal end of a left humerus
Taxon Species Locality Stratigraphic position Material Notes Images Podocarpoxylon P. dusenii
Taxon Species Locality Stratigraphic position Material Notes Images Sphaeroplea [ 14] S. striatocristata
^ Río Leona at Fossilworks .org ^ Marenssi et al., 2003, p.406 ^ Rozadilla, Sebastián; Agnolín, Federico; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (September 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 . ^ Rozadilla S, Agnolín F, Manabe M, Tsuihiji T, Novas FE (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 : Article 104881. Bibcode :2021CrRes.12504881R . doi :10.1016/j.cretres.2021.104881 . ^ Rozadilla S, Agnolín F, Manabe M, Tsuihiji T, Novas FE (2021). 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