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
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Cryobatrachus kitchingi
Colbert and Cosgriff 1974
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Colbert and Cosgriff 1974 | 1 specimen | ||||||||
nomen dubium belonging to Stereospondyli | ||||||||||
AMNH 9556, impression of portion of skull roof (paratype) | ||||||||||
Anomodontia
- Lystrosauridae
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Lystrosaurus maccaigi
Seeley 1898
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1 individual | |||||||||
AMNH 9505; specimen listed as Lystrosaurus sp. in Colbert (1974 p. 5) | ||||||||||
unclassified
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Cynodontia indet.
(Owen 1861)
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Colbert and Kitching 1977 | 2 specimens | ||||||||
AMNH 9523, 9554; possibly large representatives of the genus Thrinaxodon | ||||||||||
Thrinaxodon liorhinus
Seeley 1894
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Colbert and Kitching 1977 | 12 specimens | ||||||||
AMNH 9500, 9516, 9517, 9524, 9528, 9529, 9534, 9553, 9555, 9563, 9570, 9571 | ||||||||||
Therocephalia
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Rhigosaurus glacialis
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Colbert and Kitching 1981 | 1 specimen | ||||||||
nomen dubium belonging to Baurioidea | ||||||||||
AMNH 9525, partial skull | ||||||||||
Reptilia
- Prolacertidae
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Prolacerta broomi
Parrington 1935
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Colbert 1987 | 3 specimens | ||||||||
AMNH 9558, partially preserved skull and postcrania. AMNH 9552, postcranial bones. AMNH 9557, humerus, bone fragments | ||||||||||
Reptilia
- Procolophonidae
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Procolophon trigoniceps
Owen 1876
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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% 30000 | J. 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] |