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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
Indeterminate
Five fragmentary caudal vertebrae, incomplete ribs, two incomplete humeri, and nine osteoderms
Euiguanodontia
Indeterminate
Proximal end of a femur
Hadrosauridae
Indeterminate
Two incomplete caudal centra
Isasicursor
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
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
K. yeutensis
An incomplete right coracoid lacking sternal end and proximal end damaged
An avialan theropod , possibly member of Neornithes
Maip
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
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
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
P. pascuali
La Anita Farm
Lower right molar attached to a fragment of the dentary
A monotreme
Patagomaia
P. chainko
La Anita Farm
Partial left acetabulum and ischium
A large therian
Mosasaurs
Taxon
Species
Locality
Stratigraphic position
Material
Notes
Images
Mosasauridae
Indeterminate
Rhynchocephalian
Snakes
Taxon
Species
Locality
Stratigraphic position
Material
Notes
Images
Rionegrophis
cf. R. madtsoioides
A partial vertebra.
Serpentes
Indeterminate
Partial mid-posterior vertebrae
Turtles
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
Pollen
Marenssi, Sergio A.; Casadío, Silvio; Santillana, Sergio N. (2003), "Estratigrafía y sedimentología de las unidades del Cretácico superior-Paleógeno aflorantes en la margen sureste del lago Viedma, provincia de Santa Cruz, Argentina" (PDF) , Revista de la Asociación Geológica Argentina , 58 : 403–416, retrieved 2018-08-30
Weishampel, David B. ; Dodson, Peter ; Osmólska, Halszka (2004), The Dinosauria, 2nd edition , Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2 , retrieved 2019-02-21
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