Quebrada de los Jachaleros: Norian, Argentina
collected by J. Bonaparte 1966–1972
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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Coelurosauria indet.
(Huene 1914)
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Bonaparte 1971 | 1 specimen | ||||||||
| PVL 3848, vertebrae and hindlimb material | ||||||||||
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= Theropoda indet.
Marsh 1881
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Arcucci et al. 2004 | |||||||||
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Reptilia
- Coelophysidae
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Coelophysoidea indet.
Holtz 1994
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Ezcurra 2016 | 5 specimens | ||||||||
| PVL 4414-1 (Holotype, distal end of tibia and fibula, astragalus, calcaneum, distal tarsals 3 and 4, proximal ends of metatarsals II–IV, and most of metatarsal V from the right hindlimb) & referred specimens PVL 4414-3–5, 8. | ||||||||||
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= Powellvenator podocitus n. gen., n. sp.
Ezcurra 2017
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Ezcurra 2017 | |||||||||
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Reptilia
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Riojasuchus tenuisceps n. gen., n. sp.
Bonaparte 1969
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1 individual | |||||||||
| PVL 3827, skull and postcranial skeleton | ||||||||||
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Reptilia
- Crocodylomorpha
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Crocodylomorpha informal n. sp.
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Leardi et al. 2020 | |||||||||
| PVL 3843, postcrania (previously assigned to Hemiprotosuchus leali) | ||||||||||
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Reptilia
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Pseudhesperosuchus jachaleri n. gen., n. sp.
Bonaparte 1969
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Bonaparte 1971 | 1 individual | ||||||||
| PVL 3830. skull and postcranium | ||||||||||
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Reptilia
- Protosuchidae
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Hemiprotosuchus leali n. gen., n. sp.
Bonaparte 1969
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Bonaparte 1971 | 2 individuals | ||||||||
| PVL 3829 (holotype), skull and partial skeleton. | ||||||||||
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Reptilia
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Neoaetosauroides engaeus
Bonaparte 1969
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Desojo and Baez 2007 | 1 individual | ||||||||
| PULR 108, partial skull and postcrania | ||||||||||
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unclassified
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cf. Tritylodon sp.
Owen 1884
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Bonaparte 1971 | 1 specimen | ||||||||
| PVL 3849, postcrania | ||||||||||
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= Cynodontia indet.
Owen 1861
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Abdala and Ribeiro 2010 | |||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | La Rioja |
| Coordinates: | 29.9° South, 68.2° West (view map) | ||
| Paleocoordinates: | 39.0° South, 31.7° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | local area |
Time
| Period: | Triassic | Epoch: | Late/Upper Triassic |
| Stage: | Norian | 10 m.y. bin: | Triassic 4 |
| Key time interval: | Norian | Other zone: | Coloradian |
| Age range of interval: | 227.00000 - 208.50000 m.y. ago |
Stratigraphy
| Geological group: | Agua de la Peña | Formation: | Los Colorados | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: "upper levels" of the formation; formation is considered to be latest Triassic in age
From Kent et al. 2014: The polarity pattern in this ∼600-m-thick red- bed section can be correlated to Chrons E7r to E15n of the Newark astrochronological polarity time scale. This represents a time in- terval from 227 to 213 Ma, indicating that the Los Colorados Formation is predominantly Norian in age, ending more than 11 My before the onset of the Jurassic. | |||||
Lithology and environment
| Primary lithology: | red "siliciclastic" |
| Lithology description: "The red beds of Los Colorados Formation are composed by successive thinning-upward cycles characterized by coarse- to medium-grained sandstones and fine-grained sandstones intercalated with siltstones, which progressively dominate to the upper part of the unit (Fig. 2). Coarse-grained sandstone beds are generally tabular in geometry, cross stratified (large-scale trough and tabular cross-bedding) and locally display horizontal lamination. Rounded pebbles and cobbles of chert, quartzite and metamorphic rocks commonly mantle set boundaries. Massive and horizontal laminated siltstones interfinger with rippled lamination fine-grained sandstones forms the uppermost portion of the cycles" (Arcucci et al. 2004) | |
| Environment: | fluvial-lacustrine indet. |
| Geology comments: "The sequence was interpreted as deposited by moderately sinuous fluvial systems, which laterally interfinger with and grade into horizontally bedded flood-plain deposits. To the top of the sequence, thin-bedded sandstones and siltstones dominate and were deposited in ponds and as crevasse splays in overbank settings" (Arcucci et al. 2004)
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Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | dispersed |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Fragmentation: | occasional |
| Encrustation: | none |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | selective quarrying,mechanical,field collection,survey of museum collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | J. Bonaparte | Collection dates: | 1966–1972 |
Metadata
| Database number: | 105691 | ||
| Authorizer: | R. Butler, P. Mannion, M. Carrano | Enterer: | R. Butler, M. Carrano, G. Varnham |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2011-02-23 20:20:02 | Last modified: | 2022-02-03 09:19:30 |
| Access level: | the public | Released: | 2011-02-23 20:20:02 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 13920. | ETE | J. F. Bonaparte. 1969. Dos nuevas "faunas" de reptiles triasicos de Argentina [Two new reptilian "faunas" of the Argentine Triassic]. Gondwana Stratigraphy (IUGS Symposium, Buenos Aires) 2:283-306 [M. Carrano/M. Carrano/M. Carrano] |
Secondary references:
| 34128 | F. Abdala and A. M. Ribeiro. 2010. Distribution and diversity patterns of Triassic cynodonts (Therapsida, Cynodontia) in Gondwana. Palaeogeography, Palaeoclimatology, Palaeoecology 286:202-217 [R. Butler/R. Butler] | |
| 13000 | ETE | A. B. Arcucci, C. A. Marsicano, and A. T. Caselli. 2004. Tetrapod association and palaeoenvironment of the Los Colorados Formation (Argentina): a significant sample from western Gondwana at the end of the Triassic. Géobios 37:557-568 [M. Carrano/M. Carrano/J. Alroy] |
| 12948 | ETE | J. F. Bonaparte. 1971. Los tetrapodos del sector superior de la Formacion Los Colorados, La Rioja, Argentina (Triásico Superior) [The tetrapods of the upper part of the Los Colorados Formation, La Rioja, Argentina (Upper Triassic)]. Opera Lilloana 22:1-183 [M. Carrano/M. Carrano/M. Carrano] |
| 35285 | J. B. Desojo and A. M. Baez. 2007. Cranial morphology of the Late Triassic South American archosaur Neoaetosauroides engaeus: evidence for aetosaurian diversity. Palaeontology 50:267-276 [R. Butler/R. Butler] | |
| 76336 | M. D. Ezcurra. 2016. A new small-sized coelophysoid (Dinosauria: Theropoda) from the Upper Triassic Los Colorados Formation, NW Argentina. XXX Jornadas Argentinas de Paleontología de Vertebrados. Resúmenes. Ameghiniana 53(6 (suppl.)):61 [M. Carrano/M. Carrano/M. Carrano] | |
| 65740 | M. D. Ezcurra. 2017. A new early coelophysoid neotheropod from the Late Triassic of northwestern Argentina. Ameghiniana 54(5):506-538 [R. Butler/E. Dunne/M. Carrano] | |
| 81517 | J. M. Leardi, I. Yáñez, and D. Pol. 2020. South American Crocodylomorphs (Archosauria; Crocodylomorpha): A review of the early fossil record in the continent and its relevance on understanding the origins of the clade. Journal of South American Earth Sciences 104(102780) [P. Mannion/G. Varnham] |