Chorrillo Formation
Geologic formation in southern Patagonia, Argentina
Chorrillo Formation | |
---|---|
Stratigraphic range: Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N | |
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 | Chorrillo Formation (Argentina) |
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]
Fossils
Dinosaur remains are among the fossils that have been recovered from the formation.
Fossils recovered from the formation are:
Dinosaurs
Ornithischians
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 |
Saurischians
- 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 |
Anurans
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 |
Fishes
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 |
Mammals
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 |
Reptiles
- Mosasaurs
Taxon | Species | Locality | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Mosasauridae | Indeterminate |
- Rhynchocephalian
Taxon | Species | Locality | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Notosphenos | N. finisterre | A sphenodontid 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 |
Gastropods
Taxon | Species | Locality | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Achatinidae | Indeterminate | |||||
Bulimulidae | Indeterminate | |||||
Holospira | H. sp. | |||||
Physa | P. sp. | |||||
Pleuroceridae | Indeterminate | |||||
Pomacea | P. sp. | |||||
Potamolithus | P. sp. | |||||
Stenophysa | S. sp. |
Plants
Taxon | Species | Locality | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Podocarpoxylon | P. dusenii |
- Pollen
Taxon | Species | Locality | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Baculatisporites | B. comaumensis | |||||
B. kachaikensis | ||||||
Ceratosporites | C. equalis | |||||
Clavatipollenites | C. sp. | |||||
Clavifera | C. triplex | |||||
Concavissimisporites | Concavissimisporites sp. | |||||
Cyatheacidites | C. annulatus | |||||
Cyathidites | C. australis | |||||
C. minor | ||||||
C. rafaeli | ||||||
Foveosporites | F. canalis | |||||
Gleicheniidites | G. senonicus | |||||
Laevigatosporites | L. ovatus | |||||
Leptolepidites | L. sp. | |||||
Microcachryidites | M. antarcticus | |||||
Peninsulapollis | P. gilli | |||||
Phyllocladidites | P. mawsonii | |||||
Podocarpidites | cf. P. ellipticus | |||||
cf. P. herbstii | ||||||
P. sp. | ||||||
Retitriletes | R. austroclavatidites | |||||
Trichotomosulcites | T. subgranulatus | |||||
Trilites | T. fasolae | |||||
cf. T. tuberculiformis | ||||||
cf. T parvallatus | ||||||
Tricolpites | T. reticulatus | |||||
T. sp. | ||||||
Tuberculatosporites | T. parvus | |||||
Vitreisporites | V. signatus |
See also
References
- ^ Río Leona at Fossilworks.org
- ^ Marenssi et al., 2003, p.406
Bibliography
- 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.
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