Arazati II: Late Miocene, Uruguay
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Rodentia
- Dinomyidae
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Tetrastylus sp.
Ameghino 1886
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Rinderknecht et al. 2019 | |||||||||
| FC-DPV 2891 | ||||||||||
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Arazamys castiglionii
Rinderknecht et al. 2011
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| Holotype | ||||||||||
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Isostylomys laurillardi
(Ameghino 1883)
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Rinderknecht et al. 2018 | |||||||||
| MNHN 2187 | ||||||||||
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Mammalia
- Rodentia
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Hystricognatha indet.
Woods 1976
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Rinderknecht et al. 2019 | |||||||||
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Mammalia
- Cetacea
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Cetacea indet.
Brisson 1762
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Rinderknecht et al. 2019 | |||||||||
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Mammalia
- Panameriungulata
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Litopterna sp.
Ameghino 1889
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Rinderknecht et al. 2019 | |||||||||
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Mammalia
- Marsupialia
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Marsupialia indet.
(Illiger 1811)
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Rinderknecht et al. 2019 | |||||||||
| see common names | ||||||||||
Geography
| Country: | Uruguay | State/province: | San Jose |
| Coordinates: | 34.6° South, 57.0° West (view map) | ||
| Paleocoordinates: | 34.6° South, 54.8° West | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 6 | ||
| Key time interval: | Late Miocene | ||
| Age range of interval: | 11.63 - 5.333 m.y. ago |
Stratigraphy
| Formation: | Camacho | ||||
| Stratigraphy comments: In Arazati the sediments of the Camacho Formation represent the first 2–5 m of the base of the cliffs and the exposed littoral platform at sea level (Perea and Martinez 2004; Sprechmann et al. 2000). Field observations indicate that the sediments continue into the Rio de La Plata, although the extent and thickness under the surface of the water are unknown (Sprechmann et al. 2000).
* The said it's Huayquerian in age. Rinderknecht, et al. 2019: The mammalian fossil assemblage shows affinities with the upper Miocene Chasicoan and Huayquerian Ages/Stages of Argentina, especially with the one informally known as the “Mesopotamiense” (formerly considered as a Huayquerian local fossil fauna), of the Entre Ríos Province (Bostelmann & Rinderknecht, 2010; Brandoni, 2013; Mones & Rinderknecht, 2004; Perea et al., 1994; Perea, 2005; Perea et al., 2013; Rinderknecht et al., 2011; Vizcaíno et al., 2003). 40Sr/39 Sr dated levels of the Paraná Formation and its southern correlative, the Puerto Madryn Formation (Scasso et al., 2001), renders a late Miocene 9.5 Ma–10 Ma (Tortonian) age for the top of the Paranean Sea in Argentina. Recently, the Camacho Formation was dated in 7.5–6 Ma. using Sr-isotope stratigraphy (del Río et al., 2018) or 11–9 Ma. (Soibelzon et al., 2019) |
Lithology and environment
| Primary lithology: | lithified sandy mudstone |
| Lithology description: The sediments of the Camacho Formation are composed of conspicuous greenish gray friable and moderately compacted pelite that becomes greenish-brownish toward the top of the formation in its contact with the superposed Raigon Formation. This sedimentation episode probably represents a late Miocene transgressive event. The facies includes oyster patch reefs and incrusted ichnofossils such as Ophiomorpha nodosa and Thalassinoides sp. (Sprechmann et al. 1998, 2000), and vertebrates such as fishes, freshwater turtles, estuarine birds, and an abundant record of terrestrial mammals (Perea 2005). The holotype of A. castiglionii was recovered from the greenish sandy pelite a few meters above the shoreline of the Rio de la Plata in the Kiyu lithofacies of the Camacho Formation (Sprechmann et al. 2000). | |
| Environment: | estuary/bay |
Taphonomy
| Modes of preservation: | body,original phosphate |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Specimen is located in the Museo Nacional de Historia Natural (MNHN), Montevideo, Uruguay.
Rinderknecht, et al. 2019: The studied specimen is housed in the Vertebrate Paleontological Collection of the Facultad de Ciencias, Departamento de Paleontología, Uruguay (FC-DPV) | |
Metadata
| Database number: | 152542 | ||
| Authorizer: | C. Jaramillo, P. Mannion | Enterer: | A. Cárdenas, M. Kouvari, J. Carrillo |
| Modifier: | M. Kouvari | ||
| Created: | 2013-11-24 19:09:54 | Last modified: | 2020-09-12 06:39:18 |
| Access level: | authorizer only | Released: | 2014-11-24 19:09:54 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 49099. | A. Rinderknecht, E. Bostelmann, and M. Ubilla. 2011. New genus of giant Dinomyidae (Rodentia: Hystricognathi: Caviomorpha) from the late Miocene of Uruguay. Journal of Mammalogy 92(1):169-178 [C. Jaramillo/A. Cárdenas] |
Secondary references:
| 64975 | A. Rinderknecht, E. Bostelmann, and M. Ubilla. 2018. Making a giant rodent: cranial anatomy and ontogenetic development in the genus Isostylomeys (Mammalia, Hystricognathi, Dinomyidae). Journal of Systematic Palaeontology 16(3):245-261 [C. Jaramillo/J. Carrillo] | |
| 69863 | A. Rinderknecht, M. Ubilla, A. Manzuetti, P. Torino, and D. Perea. 2019. First record of Tetrastylus Ameghino, 1886 (Rodentia; Dinomyidae) from the Upper Miocene of Uruguay. Revista Brasileira de Paleontologia 22(1):30-37 [P. Mannion/M. Kouvari] |