Guichón (water well): Cenomanian - Santonian, Uruguay
collected by C. Rusconi, J. Aznarez 1930
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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Ornithomimidae indet.
Marsh 1890
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Huene 1934 | 1 specimen | ||||||||
| tooth "B" | ||||||||||
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= Theropoda indet.
Marsh 1881
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Soto et al. 2011 | |||||||||
| Soto & Cambiaso (2006) | ||||||||||
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Camptosaurinae indet.
Abel 1919
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Huene 1934 | 1 specimen | ||||||||
| tooth "A2" | ||||||||||
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= Kalodontidae indet.
Nopcsa 1901
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Mones 1972 | |||||||||
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= ? Ornithopoda indet.
Marsh 1881
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Weishampel and Weishampel 1983 | |||||||||
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= Iguanodontia indet.
Baur 1891
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Soto et al. 2011 | |||||||||
| Soto & Cambiaso (2006) | ||||||||||
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Camptosaurinae indet.
Abel 1919
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Huene 1934 | 1 specimen | ||||||||
| tooth "A1" | ||||||||||
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= ? Ornithopoda indet.
Marsh 1881
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Weishampel and Weishampel 1983 | |||||||||
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= Iguanodontia indet.
Baur 1891
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Soto et al. 2011 | |||||||||
| Soto & Cambiaso (2006) | ||||||||||
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Reptilia
- Uruguaysuchidae
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Uruguaysuchus aznarezi n. gen., n. sp.
Rusconi 1933
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1 specimen | |||||||||
| CA unnumbered - holotype (an approximately.1.2-m-long articulated adult individual (including a complete skull, mandible, right forelimb, 18 vertebrae, both ilia and partial right hindlimb, as well as a few associated osteoderms); 5 partial paratype skeletons also found, but now lost (Soto et al. 2011); FC-DPV 2320 - referred specimen (partial skull, a lower jaw and three cervical vertebrae) | ||||||||||
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Uruguaysuchus terrai n. sp.
Rusconi 1933
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1 specimen | |||||||||
| synonym of Uruguaysuchus aznarezi | ||||||||||
| CA unnumbered - type (a complete mandible and skull in articulation) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Uruguay | State/province: | Paysandú |
| Coordinates: | 32.3° South, 57.2° West (view map) | ||
| Paleocoordinates: | 38.8° South, 33.8° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Key time interval: | Cenomanian - Santonian | ||
| Age range of interval: | 100.50000 - 83.60000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | sandstone |
| Includes fossils? | Y |
| Lithology description: Guichón Formation comprises mainly pink-greyish to reddish sandstones, which contain moderate to well-sorted, subrounded, fine to medium-sized grains in a pelitic matrix. These sandstones (which compositionally are feldspathic wackes) are either massive or may instead exhibit parallel lamination, cross-lamination and graded bedding. | |
| Environment: | fluvial indet. |
| Geology comments: These lithologies were deposited in southwest- trending alluvial–fluvial systems comprising low-sinuosity channels traversing through sandy plains. Subordinate to the already mentioned sandstones are conglomeratic and pelitic lithologies, interpreted as channel-fill and overbank deposits, respectively. It is inferred that the Guichón Formation was deposited in warm, semi-arid climatic conditions. | |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | concentrated |
| Size of fossils: | macrofossils,mesofossils |
| Preservation of anatomical detail: | medium |
| Associated major elements: | some |
| Disassociated major elements: | some |
| Disassociated minor elements: | some |
Collection methods and comments
| Collection methods: | salvage,selective quarrying,mechanical,field collection,survey of museum collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | C. Rusconi, J. Aznarez | Collection dates: | 1930s |
Metadata
| Also known as: | Uruguaysuchus aznarezi type, Mones Loc. 10 | ||
| Database number: | 65322 | ||
| Authorizer: | M. Carrano, P. Mannion | Enterer: | M. Carrano, P. Mannion |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2006-09-21 06:19:39 | Last modified: | 2022-10-13 11:20:47 |
| Access level: | the public | Released: | 2006-09-21 06:19:39 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 78882. | C. Rusconi. 1933. Sobre reptiles cretáceos del Uruguay (Uruguaysuchus aznarezi, n.g.n.sp.) y sus relaciones con los notosúquidos de Patagonia [On the Cretaceous reptiles of Uruguay (Uruguaysuchus aznarezi, n.g.n.sp.) and their relationships with the notosuchids of Patagonia]. Instituto de Geología y Perforaciones Boletín 19:1-64 [M. Carrano/M. Carrano/M. Carrano] |
Secondary references:
| 75729 | P. Cruzado-Caballero, L. S. Filippi, A. H. Méndez, A. C. Garrido, and I. Díaz-Martínez. 2018. First ornithopod remains from the Bajo de la Carpa Formation (Santonian, Upper Cretaceous), northern Patagonia, Argentina. Cretaceous Research 83:182-193 [M. Carrano/M. Carrano/M. Carrano] | |
| 79220 | C. Goso Aguilar and D. Perea. 2004. El Cretácico post-basáltico y el Terciario Inferior de la Cuenca Litoral de Río Uruguay: geología y paleontología []. In G. Veroslavsky, M. Ubilla, & S. Martínez (eds.), Cuencas Sedimentarias de Uruguay. Geología, Paleontología y Recursos Naturales. Mesozoico 143-171 [M. Carrano/M. Carrano] | |
| 64844 | F. v. Huene. 1934. Nuevos dientes de Saurios de cretáceo del Uruguay [New saurian teeth from the Cretaceous of Uruguay]. Boletín, Instituto de Geología y Perforaciones (Uruguay) 21:13-20 [M. Carrano/M. Carrano] | |
| 24360 | ETE | F. v. Huene. 1934. Neue Saurier-Zähne aus der Kreide von Uruguay [New saurian teeth from the Cretaceous of Uruguay]. Centralblatt für Mineralogie, Geologie und Paläontologie, Abteilung B: Geologie und Paläontologie 1934(4):183-189 [M. Carrano/M. Carrano] |
| 82857 | R. Lambert. 1941. Estado actual de nuestros conocimientos sobra la geología de la República Oriental del Uruguay [Current state of our knowledge about the geology of the Oriental Republic of Uruguay]. Boletin del Instituto Geológico del Uruguay 29:1-89 [M. Carrano/M. Carrano] | |
| 18841 | ETE | A. Mones. 1972. Lista de los vertebrados fosiles del Uruguay, I. Chondrichthyes, Osteichthyes, Reptilia, Aves [List of the fossil vertebrates of Uruguay, I. Chondrichthyes, Osteichthyes, Reptilia, Aves]. Comunicaciones Paleontologicas del Museo de Historia Natural de Montevideo 1(3):23-35 [M. Carrano/M. Carrano] |
| 79333 | Á Mones. 1997. Los vertebrados mesozoicos del Uruguay y sus relaciones con los de áreas vecinas [The Mesozoic vertebrates of Uruguay and their relationships with those of neighboring areas]. In J. Arroyo Cabrales & Ó. J. Polaco (ed.), Homenaje al Profesor Ticul Álvarez. Colección Científica (Instituto Nacional de Antropología e Historia (Mexico)) 357:205-222 [M. Carrano/M. Carrano] | |
| 42879 | M. Soto, D. Perea, and A. Cambiaso. 2012. First sauropod (Dinosauria: Saurischia) remains from the Guichón Formation, Late Cretaceous of Uruguay. Journal of South American Earth Sciences 33(1):68-79 [P. Mannion/P. Mannion/M. Carrano] | |
| 39436 | M. Soto, D. Pol, and D. Perea. 2011. A new specimen of Uruguaysuchus aznarezi (Crocodyliformes: Notosuchia) from the middle Cretaceous of Uruguay and its phylogenetic relationships. Zoological Journal of the Linnean Society 163:S173-S198 [P. Mannion/P. Mannion] | |
| 61518 | D. B. Weishampel and J. B. Weishampel. 1983. Annotated localities of ornithopod dinosaurs: implications to Mesozoic paleobiogeography. The Mosasaur 1:43-87 [M. Carrano/M. Carrano] |