La Chilca Creek, El Salto: Norian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Anomodontia
- Stahleckeriidae
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Jachaleria colorata n. gen., n. sp.
Bonaparte 1971
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| see common names | |||||||
Geography
| Country: | Argentina | State/province: | San Juan |
| Coordinates: | 29.8° South, 68.2° West (view map) | ||
| Paleocoordinates: | 39.0° South, 31.7° 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: "basal part" 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)
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Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | selective quarrying |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 105698 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2011-02-24 01:26:06 | Last modified: | 2013-11-05 16:34:34 |
| Access level: | the public | Released: | 2011-02-24 01:26:06 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 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] |
Secondary references:
| 48761 | R. N. Martínez, C. Apaldetti, O. A. Alcober, C. E. Colombi, P. C. Sereno, E. Fernandez, P. Santi Malnis, G. A. Correa, and D. Abelin. 2013. Vertebrate succession in the Ischigualasto Formation. In P. C. Sereno (ed.), Basal Sauropodomorphs and the Vertebrate Fossil Record of the Ischigualasto Formation (Late Triassic: Carnian–Norian) of Argentina. Society of Vertebrate Paleontology Memoir 12. Journal of Vertebrate Paleontology 32(6 (s1)):10-30 [M. Carrano/M. Carrano/M. Carrano] |