E of Cerro Rajado: Norian, Argentina
collected 1971

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Tritheledontidae
Chaliminia musteloides n. gen., n. sp. Bonaparte 1980
Arcucci et al. 2004 1 individual
PVL 385, partial skull
Reptilia - Massospondylidae
Coloradia brevis n. gen., n. sp. Bonaparte 1978
1 individual
recombined as Coloradisaurus brevis
see common names

Geography
Country:Argentina State/province:La Rioja County:General Lavalle
Coordinates: 29.7° South, 68.2° West (view map)
Paleocoordinates:38.9° South, 31.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Triassic Epoch:Late/Upper Triassic
Stage:Norian 10 m.y. bin:Triassic 4
Key time interval:Norian
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 third of formation, 180 m below top; upper "Coloradian" provincial age; 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
Degree of concentration:dispersed
Size of fossils:macrofossils
Preservation of anatomical detail:good
Associated major elements:all
Fragmentation:occasional
Temporal resolution:snapshot
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Collection dates:1971
Metadata
Also known as:Coloradisaurus holotype
Database number:52014
Authorizer:M. Carrano, R. Butler Enterer:M. Carrano, R. Butler
Modifier:M. Carrano Research group:vertebrate
Created:2005-07-11 15:22:56 Last modified:2012-04-09 17:09:12
Access level:the public Released:2005-07-11 15:22:56
Creative Commons license:CC BY
Reference information

Primary reference:
13923.ETE J. F. Bonaparte. 1978. Coloradia brevis n. g. et n. sp. (Saurischia–Prosauropoda), dinosaurio Plateosauridae de la Formacion Los Colorados, Triasico Superior de La Rioja, Argentina [Coloradia brevis n. g. et n. sp. (Saurischia–Prosauropoda), a plateosaurid from the Upper Triassic Los Colorados Formation of La Rioja, Argentina]. Ameghiniana 15(3-4):327-332 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

13000ETE 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]