Gordon Valley: Anisian, Antarctica
collected by Hammer 1985-
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Amphibia
- Temnospondyli
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Kryostega collinsoni
Sidor et al. 2008
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1 specimen | |||||||||
| AMNH 24419, skull fragment | ||||||||||
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Amphibia
- Temnospondyli
- Benthosuchidae
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Benthosuchidae indet.
Efremov 1940
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Wang et al. 2013 | 1 specimen | ||||||||
| AMNH 24415 | ||||||||||
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Amphibia
- Temnospondyli
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Antarctosuchus polyodon
Sidor et al. 2014
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Sidor et al. 2014 | 1 specimen | ||||||||
| AMNH 24411 | ||||||||||
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Kannemeyeriiformes
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Kannemeyeriidae indet.
Huene 1948
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Hammer 1995 | 1 specimen | ||||||||
| AMNH 24403, right maxillary fragment | ||||||||||
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= Kannemeyeriiformes indet.
Huene 1948
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Fröbisch 2009 | |||||||||
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Anomodontia
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Kannemeyeriiformes indet.
(Huene 1948)
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Smith et al. 2020 | 2 specimens | ||||||||
| AMNH FARB 24412 (maxillary tooth root including a small portion of maxillary bone) and LACM-DI 160748 (Smith et al. 2020 also describe AMNH 24403) | ||||||||||
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Cynognathidae
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Cynognathidae indet.
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Hammer 1995 | 3 specimens | ||||||||
| AMNH 24407, partial dentary; AMNH 24406, jaw fragment; AMNH 24423, partial right mandible | ||||||||||
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unclassified
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Diademodontidae indet.
Haughton 1925
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Hammer 1995 | 1 specimen | ||||||||
| AMNH 24421, skull fragment | ||||||||||
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= Diademodon sp.
Seeley 1895
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Kammerer et al. 2010 | |||||||||
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Cynognathus sp.
Seeley 1895
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Hammer 1995 | 1 specimen | ||||||||
| AMNH 24422, left mandible | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Antarctica |
| Coordinates: | 84.3° South, 164.1° East (view map) |
| Paleocoordinates: | 76.9° South, 79.5° East |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| Stage: | Anisian | 10 m.y. bin: | Triassic 2 |
| Key time interval: | Anisian | ||
| Age range of interval: | 247.20000 - 242.00000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | quartzose,intraclastic lithified silty conglomerate | ||
| Includes fossils? | Y | ||
| Lithology description: Hammer 1995 says "8 meter thick quartzose sandstone containing sizeable logs and siltstone clasts" Sidor et al. 2008 says "Most of the clasts in the conglomerate are rounded and are made up of greenish-gray siltstone that is lithologically the same as a siltstone that underlies the bone bed. The elongate clasts in the conglomerate exhibit no preferred orientation; however, the underlying sandstones indicate a general northwest paleocurrent. The clasts range in diameter from 5 mm to about 60 cm, with an average size of 5–10 cm. The conglomerate has a matrix of medium-grained, quartz-rich sand, similar to un- derlying channel sands. The fact that the conglomerate is domi- nated by intraclasts that were derived from underlying siltstones indicates that the transporting flow was carrying locally eroded material that was transported a relatively short distance. The nature of the unit suggests rapid deposition from a large flow of relatively high viscosity and moderate to lower velocity (Krissek et al., 1991). " | |||
| Environment: | "channel" | Tectonic setting: | foreland basin |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | medium |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | surface (in situ),field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | AMNH | ||
| Collectors: | Hammer | Collection dates: | 1985-86 |
Metadata
| Database number: | 105296 | ||
| Authorizer: | R. Butler, C. Sidor, E. Dunne | Enterer: | R. Butler, C. Sidor, E. Dunne |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2011-02-18 23:17:23 | Last modified: | 2015-12-15 19:57:24 |
| Access level: | the public | Released: | 2011-02-18 23:17:23 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 38098. | C. A. Sidor, R. Damiani, and W. R. Hammer. 2008. A new Triassic temnospondyl from Antarctica and a review of Fremouw Formation biostratigraphy. Journal of Vertebrate Paleontology 28(3):656-663 [C. Sidor/B. Peecook] |
Secondary references:
| 33223 | J. Fröbisch. 2009. Composition and similarity of global anomodont-bearing tetrapod faunas. Earth-Science Reviews 95:119-157 [R. Butler/R. Butler] | |
| 35220 | W. R. Hammer. 1995. New therapsids from the Upper Fremouw Formation of Antarctica. Journal of Vertebrate Paleontology 15:105-112 [R. Butler/R. Butler] | |
| 34461 | C. F. Kammerer, J. J. Flynn, L. Ranivoharimanana and A. R. Wyss. 2010. The first record of a probainognathian (Cynodontia: Chiniquodontidae) from the Triassic of Madagascar. Journal of Vertebrate Paleontology 30(6):1889-1894 [R. Butler/R. Butler] | |
| 55307 | C. A. Sidor, J. S. Steyer, and W. R. Hammer. 2014. A new capitosauroid temnospondyl from the Middle Triassic upper Fremouw Formation of Antarctica. 34:539-548 [C. Sidor/C. Sidor] | |
| 74294 | N. D. Smith, P. J. Makovicky, C. A. Sidor and W. R. Hammer. 2020. A kannemeyeriiform (Synapsida: Dicynodontia) occipital plate from the Middle Triassic upper Fremouw Formation of Antarctica. Journal of Vertebrate Paleontology e1829634 [E. Dunne/E. Dunne/P. Mannion] | |
| 57427 | R. Wang, S. Xu, X. Wu, C. Li, and S. Wang. 2013. A new specimen of Shansisuchus shansisuchus Young, 1964 (Diapsida: Archosauriformes) from the Triassic of Shanxi, China. Acta Geologica Sinica 87(5):1185-1197 [R. Butler/R. Butler] |