Balde de Leyes (Norian, Quebrada del Barro): Norian - Rhaetian, Argentina

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Ingentia prima n. gen., n. sp. Apaldetti et al. 2018
Apaldetti et al. 2018 1 specimen
PVSJ 1086
Reptilia - Rhynchocephalia
Sphenotitan leyesi n. gen., n. sp. Martinez et al. 2013
9 specimens
PVSJ 886 (holotype), posterior portion of skull; PVSJ 887, left dentary; PVSJ 888, both incomplete maxillae, anterior part of both lower jaws, both premaxillae; PVSJ 889, left maxilla; PVSJ 890, right quadrate; PVSJ 891, incomplete lower jaws; PVSJ 892, right palatine, pterygoid and ectopterygoid; PVSJ 893, right premaxilla and postorbital, left incomplete palatine and pterygoid; PVSJ 895, articulated sequence of three distal dorsal vertebrae, sacral vertebrae 1 and 2, and first caudal vertebra
see common names

Country:Argentina State/province:San Juan County:Caucete Department
Coordinates: 31.6° South, 67.4° West (view map)
Paleocoordinates:39.8° South, 29.7° West
Basis of coordinate:estimated from map
Period:Triassic Epoch:Late/Upper Triassic
10 m.y. bin:Triassic 4
Key time interval:Norian - Rhaetian
Age range of interval:228.00000 - 201.30000 m.y. ago
Geological group:Marayes Formation:Quebrada del Barro
Stratigraphic resolution:bed
Stratigraphy comments: A recent stratigraphic revision (Martinez et al., 2013 (ref. 58021)- supplementary information) proposes that the upper horizon of the Quebrada del Barro containing Leyasaurus marayensis should be classified as a separate stratigraphic unit from the other (lower) horizons of the Quebrada del Barro. The other horizons are assigned to Norian age based on Sphenotitan leyasi occurring in the same horizons as several other Triassic-affinity species. These other species are known from the Norian Los Colorados Fm., which was recently dated using magnetostratigraphy.
Lithology and environment
Primary lithology:red sandstone
Secondary lithology: siltstone
Includes fossils?Y
Lithology description: "The Quebrada del Barro Formation is characterized by a bright reddish succession of coarse sandstone and conglomerate interlaid with fine clay-rich mudstone characterized by isolated granules and calcisol development."
Environment:alluvial fan
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:good
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Database number:176414
Authorizer:P. Barrett, G. Lloyd Enterer:T. Cleary, G. Lloyd
Modifier:P. Mannion Research group:vertebrate
Created:2016-02-11 11:30:03 Last modified:2019-04-09 10:56:23
Access level:the public Released:2016-02-11 11:30:03
Creative Commons license:CC BY
Reference information

Primary reference:

58021. R. N. Martinez, C. Apaldetti, C. E. Colombi, A. Praderio, E. Fernandez, P. S. Malnis, G. A. Correa, D. Abelin, and O. Alcober. 2013. A new sphenodontian (Lepidosauria: Rhynchocephalia) from the Late Triassic of Argentina and the early origin of the herbivore opisthodontians. Proceedings of the Royal Society B 280(1772):20132057-1-20132057-7 [P. Barrett/T. Cleary]

Secondary references:

67318 C. Apaldetti, R. N. Martínez, I. A. Cerda, D. Pol, and O. Alcober. 2018. An early trend towards gigantism in Triassic sauropodomorph dinosaurs. Nature Ecology & Evolution 2:1227-1232 [G. Lloyd/G. Lloyd]