Collinson Ridge (Fremouw Fm., 85 m above base): Early/Lower Triassic, Antarctica
collected by J. W. Kitching 1970-1971
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Prolacertidae
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Prolacerta broomi
Parrington 1935
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Colbert 1987 | 6 specimens | ||||||||
| AMNH 9520, 9521, 9522, 9526, 9551, 9574 | ||||||||||
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Reptilia
- Procolophonidae
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Procolophon trigoniceps
Owen 1876
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3 individuals | |||||||||
| AMNH 9518 (two partial skulls), 9533 (badly crushed skull) | ||||||||||
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Therocephalia
- Akidnognathidae
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Akidnognathidae indet.
Nopcsa 1923
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Huttenlocker and Sidor 2012 | 1 specimen | ||||||||
| AMNH FARB 9527, partial skull | ||||||||||
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Anomodontia
- Lystrosauridae
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Lystrosaurus curvatus
(Owen 1876)
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Owen 1876 | |||||||||
| AMNH 9515, partial skull | ||||||||||
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unclassified
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? Austrobrachyops jenseni
Colbert and Cosgriff 1974
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Cosgriff and Hammer 1984 | 2 specimens | ||||||||
| nomen dubium belonging to Tetrapoda | ||||||||||
| USUOM 31404, 31430 | ||||||||||
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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 9541 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Antarctica |
| Coordinates: | 85.2° South, 175.5° West (view map) |
| Paleocoordinates: | 81.8° South, 69.3° East |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Early/Lower Triassic |
| 10 m.y. bin: | Triassic 1 | ||
| Key time interval: | Early/Lower Triassic | ||
| Age range of interval: | 251.90200 - 247.20000 m.y. ago |
Stratigraphy
| Geological group: | Beacon | Formation: | Fremouw | ||
| Local section: | Collinson Ridge | Local bed: | 85 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "lower portion of the Fremouw Formation, of Early Triassic age" (Colbert & Kitching, 1975);
According to fig. 10 in Collinson et al. (2006, GSA Bull. 118(5/6)) Procolophon and associate vertebrate remains come from about 85 m above the base of the Fremouw Fm. | |||||
Lithology and environment
| Primary lithology: | gray,green mudstone | ||
| Includes fossils? | Y | ||
| Lithology description: lithology is inferred from fig. 10 in Collinson et al. (2006, GSA Bull. 118(5/6)) | |||
| Environment: | fluvial indet. | Tectonic setting: | foreland basin |
| Geology comments: "Late Permian and Triassic rocks in the central Transantarctic Mountains were deposited in a retroarc foreland basin (Dalziel and Elliot, 1982; Collinson, 1990, 1991; Isbell, 1991; Collinson et al., 1994)." (Collinson et al., 2006 p. 749); "The entire Upper Permian and Lower to Middle Triassic fluvial sequence in the central Transantarctic Mountains was deposited by low-sinuosity braided streams (Barrett et al., 1986)." (Collinson et al., 2006 p. 757) | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | variable |
| Articulated whole bodies: | none |
| Temporal resolution: | snapshot |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | AMNH | ||
| Collectors: | J. W. Kitching | Collection dates: | austral summer 1970-1971 |
| Collection method comments: "All specimens were collected by J. W. Kitching, except AMNH 9509, collected by Thomas Rich, and AMNH 9510, collected by John Ruben." (Colbert & Kitching, 1975) | |||
Metadata
| Also known as: | Cumulus Hills; Halfmoon Bluff; Sentinel Hill | ||
| Database number: | 87414 | ||
| Authorizer: | J. Mueller, A. Dunhill, R. Butler | Enterer: | T. Liebrecht, B. Allen, R. Butler |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2009-03-17 08:36:58 | Last modified: | 2011-02-22 09:51:24 |
| Access level: | the public | Released: | 2009-03-17 08:36:58 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 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] |
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] | |
| 43612 | J. W. Cosgriff and W. R. Hammer. 1984. New material of labyrinthodont amphibians from the Lower Triassic Fremouw Formation of Antarctica. Journal of Vertebrate Paleontology 4(1):47-56 [R. Butler/R. Butler] | |
| 48075 | A. K. Huttenlocker and C. A. Sidor. 2012. Taxonomic revision of therocephalians (Therapsida: Theriodontia) from the Lower Triassic of Antarctica. American Museum Novitates 3738:1-19 [C. Sidor/C. Sidor] | |
| 29040 | R. Owen. 1876. Descriptive and Illustrated catalogue of the Fossil Reptilia of South Africa in the Collection of the British Museum of Natural History. [H. Sims/J. Camp] |