Chañares River, 4 km north: Ladinian, Argentina
collected by A. Romer & J. Jensen 1964

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Traversodontidae
Cynodontia indet. Owen 1861
Romer 1972
"parts of a gomphodont skeleton"
    = Massetognathus teruggii Romer 1967
Sereno and Arcucci 1994
synonym of Massetognathus pascuali
Reptilia
Thecodontia indet. Owen 1859
Romer 1972 1 individual
    = Lagerpeton chanarensis Romer 1971
Romer 1972
MCZ 4121, postcranial material
Lewisuchus admixtus n. gen., n. sp. Romer 1972
Romer 1972 1 individual
MLP 65-XI-14-14 (= PULR 01), partial skull and postcranial material
Thecodontia indet. Owen 1859
Romer 1972
    = Lagosuchus sp. Romer 1971
Romer 1972
nomen dubium belonging to Dinosauriformes
Reptilia - Proterochampsidae
Proterochampsidae indet. Romer 1966
Bittencourt et al. 2014
Chanaresuchus sp. Romer 1971
Bittencourt et al. 2014 1 specimen
PULR 07
see common names

Geography
Country:Argentina State/province:La Rioja
Coordinates: 29.8° South, 67.8° West (view map)
Paleocoordinates:49.9° South, 37.8° West
Basis of coordinate:estimated from map
Altitude:1515 meters
Geographic resolution:small collection
Time
Period:Triassic Epoch:Middle Triassic
Stage:Ladinian 10 m.y. bin:Triassic 2
*Period:Middle Triassic *Epoch:Ladinian
Key time interval:Ladinian
Age range of interval:242.00000 - 237.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Agua de la Peña Formation:Chañares
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: not reported
Environment:fluvial-lacustrine indet.
Taphonomy
Modes of preservation:body,concretion
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:some
Fragmentation:occasional
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:MCZ,MLP
Collectors:A. Romer & J. Jensen Collection dates:1964
Metadata
Also known as:Los Chañares
Database number:13271
Authorizer:J. Alroy, R. Butler, M. Carrano Enterer:R. Whatley, M. Carrano, R. Butler
Modifier:M. Carrano Research group:vertebrate
Subset of collection #:26092
Created:2002-02-09 17:08:59 Last modified:2021-06-30 09:49:35
Access level:the public Released:2002-02-09 17:08:59
Creative Commons license:CC BY
Reference information

Primary reference:
17343.ETE A. S. Romer and J. A. Jensen. 1966. The Chañares (Argentina) Triassic reptile fauna. II. Sketch of the geology of the Río Chañares-Río Gualo region. Breviora 252:1-20 [M. Carrano/M. Carrano]

Secondary references:

77276 J. S. Bittencourt, A. B. Arcucci, C. A. Marsicano and M. C. Langer. 2014. Osteology of the Middle Triassic archosaur Lewisuchus admixtus Romer (Chañares Formation, Argentina), its inclusivity, and relationships amongst early dinosauromorphs. Journal of Systematic Palaeontology 13(3):189-219 [M. Carrano/M. Carrano/M. Carrano]
13751ETE A. S. Romer. 1972. The Chañares (Argentina) Triassic reptile fauna. XV. Further remains of the thecodonts Lagerpeton and Lagosuchus. Breviora 394:1-7 [M. Carrano/M. Carrano/M. Carrano]
43995% 38760A. S. Romer. 1972. The Chañares (Argentina) Triassic reptile fauna; XIV, Lewisuchus admixtus, gen. et sp. nov., a further thecodont from the Chañares beds. Breviora 390:1-13 [J. Alroy/R. Whatley/J. Alroy]
13754ETE P. C. Sereno and A. B. Arcucci. 1994. Dinosaurian precursors from the Middle Triassic of Argentina: Lagerpeton chanarensis. Journal of Vertebrate Paleontology 13(4):385-399 [M. Carrano/M. Carrano/M. Carrano]