Etjo Mtn general, below lowest arenaceous layer: Anisian, Namibia
collected by Keyser
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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| 1 specimen | ||||||||||
| R314, small lower jaw | ||||||||||
| Abdala and Ribeiro 2010 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Namibia |
| Coordinates: | 21.1° South, 16.5° East (view map) |
| Paleocoordinates: | 37.5° South, 6.3° West (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| Stage: | Anisian | 10 m.y. bin: | Triassic 2 |
| Key time interval: | Anisian | Other zone: | Cynognathus subzone B |
| Age range of interval: | 246.7 - 241.464 m.y. ago |
Stratigraphy
| Geological group: | Karoo | Formation: | Omingonde | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Referred to as the "Lower Etjo Beds" by Keyser (1973) but now called the Omingonde Formation. "Based on the co-occurrence of Kannemeyeria and Erythrosuchus in subzone B of the Cynognathus Assemblage Zone, the Omingonde Formation may be broadly assigned an Anisian age." (Damiani et al. 2007. Palaeontology 50: 1531-1546)
Abdala & Smith (2009) suggest the possibility of two different faunas in the upper Omingonde Formation; an older one corresponding to Cynognathus Subzone B and the upper possibly to Cynognathus Subzone C. On the basis of the presence of Chiniquodon in the upper fauna, Abdala & Smith (2009) tentatively suggested that the Omingonde could extend into the early Ladinian. The low stratigraphic position of this specimen in the Omingonde would place it in the lower fauna, of early Anisian age. | |||||
Lithology and environment
| Primary lithology: | nodular "shale" | ||
| Includes fossils? | Y | ||
| Environment: | terrestrial indet. | Tectonic setting: | rift |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Keyser |
| Collection method comments: Specimens in the collections of the Geological Survey of South Africa, Pretoria | |
Metadata
| Database number: | 99456 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2010-11-11 23:38:51 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2010-11-11 23:38:51 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 34203. | A. W. Keyser. 1973. A new Triassic vertebrate fauna from South West Africa. Palaeontologia africana 16:1-15 [R. Butler/R. Butler] |
Secondary references:
| 34128 | F. Abdala and A. M. Ribeiro. 2010. Distribution and diversity patterns of Triassic cynodonts (Therapsida, Cynodontia) in Gondwana. Palaeogeography, Palaeoclimatology, Palaeoecology 286:202-217 [R. Butler/R. Butler] | |
| 34212 | F. Abdala and R. M. H. Smith. 2009. A Middle Triassic cynodont fauna from Namibia and its implications for the biogeography of Gondwana. Journal of Vertebrate Paleontology 29:837-851 [R. Butler/R. Butler] | |
| 34213 | R. M. H. Smith and R. Swart. 2002. Changing fluvial environments and vertebrate taphonomy in response to climatic drying in a mid-Triassic rift valley fill: the Omingonde Formation (Karoo Supergroup) of central Namibia. Palaios 17:249-267 [R. Butler/R. Butler] |