Provincial Road no. 26, kilometer 142: Norian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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Neoaetosauroides engaeus
Bonaparte 1969
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2 individuals | |||||||||
| PVL 4363, 5732, partial skulls with postcrania | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | La Rioja |
| Coordinates: | 29.9° South, 68.0° West (view map) | ||
| Paleocoordinates: | 39.0° South, 31.5° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
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: | bed | ||||
| Stratigraphy comments: "upper levels" of the formation; formation is considered to be latest Triassic in age | |||||
Lithology and environment
| Primary lithology: | red "siliciclastic" |
| Includes fossils? | Y |
| 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) | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Fragmentation: | occasional |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: PVL: Palaeontologia de Vertebrados, Instituto Miguel Lillo, Tucuman, Argentina | |
Metadata
| Database number: | 105695 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2011-02-24 00:54:26 | Last modified: | 2012-04-09 17:06:58 |
| Access level: | the public | Released: | 2011-02-24 00:54:26 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 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] |
Secondary references:
| 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] |