Klein Gai-As, lower Gai-As Formation, Huab Basin: Wordian - Capitanian, Namibia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Carditida
- Astartidae
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Terraia cf. curvata
(Reed 1929)
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1 specimen | |||||||||
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Terraia cf. altissima
(Holdhaus 1918)
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5 specimens | |||||||||
| 4 silicified shells, 1 internal mold | ||||||||||
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Bivalvia
- Pholadomyida
- Pachydomidae
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Cowperesia emerita
(Reed 1929)
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12 specimens | |||||||||
| 6 with silicified shell (partial), 6 internal molds | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Namibia |
| Coordinates: | 20.8° South, 14.1° East (view map) |
| Paleocoordinates: | 41.9° South, 18.3° West (Wright 2013) |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Permian | Epoch: | Guadalupian |
| Stage: | Wordian - Capitanian | 10 m.y. bin: | Permian 4 |
| Key time interval: | Wordian - Capitanian | ||
| Age range of interval: | 266.9 - 259.51 m.y. ago |
Stratigraphy
| Formation: | Gai-As | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: In this unit, just above the last occurrences of bivalves, there are volcanic tufs, and radiometric dating of zircon minerals from them yields ages of 265+2.5 Ma, nearly at the Wordian–Capitanian limit, Guadalupian Epoch (Stollhofen et al. 2000). | |||||
Lithology and environment
| Primary lithology: | wave ripples,medium lithified sandstone |
| Environment: | lacustrine - large |
Taphonomy
| Modes of preservation: | body,mold/impression,replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 101184 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | freshwater |
| Created: | 2010-12-18 03:44:36 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2010-12-18 03:44:36 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 34564. | J. M. David, M. G. Simões, L. E. Anelli, R. Rohn, and F. Holzfoerster. 2011. Permian bivalves from the Gai-As Formation, northern Namibia: systematics, taphonomy, and biostratigraphy. Alcheringa 35:497-516 [M. Clapham/M. Clapham/M. Clapham] |