Provincial Road no. 26, kilometer 140: Norian, Argentina
collected 1994
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Tritheledontidae
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Chaliminia musteloides
Bonaparte 1980
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1 individual | |||||||||
| PVL 3857, skull | ||||||||||
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Reptilia
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Neoaetosauroides engaeus
Bonaparte 1969
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Desojo and Baez 2007 | 1 individual | ||||||||
| PVL 5698, incomplete skull and 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: | 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 | |||||
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 |
| Preservation of anatomical detail: | medium |
| Fragmentation: | occasional |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis | Collection dates: | 1994 |
Metadata
| Also known as: | La Esquina | ||
| Database number: | 101991 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2011-01-06 04:37:20 | Last modified: | 2012-04-09 17:10:09 |
| Access level: | the public | Released: | 2011-01-06 04:37:20 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 34664. | A. G. Martinelli and G. W. Rougier. 2007. On Chaliminia musteloides (Eucynodontia: Tritheledontidae) from the Late Triassic of Argentina, and a phylogeny of Ictidosauria. Journal of Vertebrate Paleontology 27:442-460 [R. Butler/R. Butler] |
Secondary references:
| 35286 | J. B. Desojo and A. M. Baez. 2005. El esqueleto postcraneano de Neoaetosauroides (Archosauria: Aetosauria) del Triásico Superior del centro-oeste de Argentina. Ameghiniana 42:115-126 [R. Butler/R. Butler] | |
| 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] |