Thrinaxodon Col (Fremouw Formation): Early/Lower Triassic, Antarctica
collected by J. W. Kitching 1969-1970, 1970-1971

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Amphibia - Temnospondyli
Cryobatrachus kitchingi Colbert and Cosgriff 1974
Colbert and Cosgriff 1974 1 specimen
nomen dubium belonging to Stereospondyli
AMNH 9556, impression of portion of skull roof (paratype)
Anomodontia - Lystrosauridae
Lystrosaurus maccaigi Seeley 1898
1 individual
AMNH 9505; specimen listed as Lystrosaurus sp. in Colbert (1974 p. 5)
unclassified
Cynodontia indet. (Owen 1861)
Colbert and Kitching 1977 2 specimens
AMNH 9523, 9554; possibly large representatives of the genus Thrinaxodon
Thrinaxodon liorhinus Seeley 1894
Colbert and Kitching 1977 12 specimens
AMNH 9500, 9516, 9517, 9524, 9528, 9529, 9534, 9553, 9555, 9563, 9570, 9571
Therocephalia
Rhigosaurus glacialis
Colbert and Kitching 1981 1 specimen
nomen dubium belonging to Baurioidea
AMNH 9525, partial skull
Reptilia - Prolacertidae
Prolacerta broomi Parrington 1935
Colbert 1987 3 specimens
AMNH 9558, partially preserved skull and postcrania. AMNH 9552, postcranial bones. AMNH 9557, humerus, bone fragments
Reptilia - Procolophonidae
Procolophon trigoniceps Owen 1876
Colbert and Kitching 1975 1 individual
AMNH 9507
see common names

Geography
Country:Antarctica
Coordinates: 85.1° South, 174.8° West (view map)
Paleocoordinates:81.8° South, 69.8° East
Basis of coordinate:stated in text
Geographic resolution:local area
Time
Period:Triassic Epoch:Early/Lower Triassic
10 m.y. bin:Triassic 1
*Period:Early/Lower Triassic *Epoch:Scythian
Key time interval:Early/Lower Triassic Zone: Lystrosaurus
Age range of interval:252.17000 - 247.20000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Beacon Formation:Fremouw
Stratigraphic resolution:member
Stratigraphy comments: "Thrinaxodon Col section in the Cumulus Hills" (Cosgriff et al., 1982);
According to Collinson et al. (2006, GSA Bull. 118(5/6) fig. 6) Lystrosaurus occurs in three different levels within the Thrinaxodon Col section but no horizon is given for any particular specimen in Cosgriff et al. (1982) or elsewhere.
Lithology and environment
Primary lithology:medium sandstone
Secondary lithology:gray,green mudstone
Lithology description: Lithology and environmental data are from Collinson et al. (2006, GSA Bull. 118(5/6))
Environment:fluvial indet. Tectonic setting:foreland basin
Taphonomy
Modes of preservation:body,mold/impression
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Articulated whole bodies:none
Associated major elements:many
Disassociated major elements:some
Disassociated minor elements:none
Temporal resolution:snapshot
Spatial resolution:autochthonous
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:J. W. Kitching Collection dates:austral summers 1969-1970, 1970-1971
Taxonomic list comments:In their 1975 paper Colbert & Kitching give the same coordinates for the locality Procolophon was collected at ("Mount Kenyon") as they give in their 1977 paper for the Thrinaxodon Col locality (note that longitude in reality is W from GM and not E from GM as stated in the paper). Also, Collinson et al. (2006 fig. 6) list Procolophon among the genera found at the Thrinaxodon Col locality. Hence, the Procolophon specimen from "Mount Kenyon" is included here.
Metadata
Also known as:Mount Kenyon; Cumulus Hills
Database number:27266
Authorizer:J. Alroy, J. Mueller, C. Sidor, R. Butler Enterer:R. Whatley, T. Liebrecht, R. Butler, C. Sidor
Modifier:T. Liebrecht Research group:vertebrate
Created:2002-11-26 14:33:49 Last modified:2012-11-16 17:03:39
Access level:the public Released:2002-11-26 14:33:49
Creative Commons license:CC BY
Reference information

Primary reference:

7538.5% 30000J. W. Cosgriff, W. R. Hammer, and W. J. Ryan. 1982. The Pangaean reptile, Lystrosaurus maccaigi, in the Lower Triassic of Antarctica. Journal of Paleontology 56(2):371-385 [J. Alroy/R. Whatley/R. Whatley]

Secondary references:

35275 E. H. Colbert. 1987. The Triassic reptile Prolacerta in Antarctica. American Museum Novitates 2882:1-19 [R. Butler/R. Butler]
43611 E. H. Colbert and J. W. Cosgriff. 1974. Labyrinthodont amphibians from Antarctica. American Museum Novitates 2552:1-30 [R. Butler/R. Butler]
29423 E. H. Colbert and J. W. Kitching. 1975. The Triassic Reptile Procolophon in Antarctica. American Museum Novitates 2566:1-23 [J. Mueller/T. Liebrecht]
29626 E. H. Colbert and J. W. Kitching. 1977. Triassic Cynodont Reptiles From Antarctica. American Museum Novitates 2611:1-30 [J. Mueller/T. Liebrecht]
48077 E. H. Colbert and J. W. Kitching. 1981. Scaloposaurian reptiles from the Triassic of Antarctica. American Museum Novitates 2709:1-30 [C. Sidor/C. Sidor]