Ridge north of Wadi Alwa, Wadi Alwa I, collection 117A: Smithian, Oman
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
- Ceratitida
- Hedenstroemiidae
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Hedenstroemia cf. himalayica
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Cephalopoda
- Ceratitida
- Flemingitidae
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Flemingites cf. griesbachi
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Chondrichthyes
- Synechodontiformes
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Polyfaciodus pandus
Koot and Cuny 2014
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Koot et al. 2015 | ||||||
Safrodus tozeri
Koot and Cuny 2014
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Koot et al. 2015 | ||||||
see common names |
Geography
Country: | Oman |
Coordinates: | 23.2° North, 58.4° East (view map) |
Paleocoordinates: | 28.2° South, 54.5° East |
Basis of coordinate: | estimated from map |
Geographic resolution: | small collection |
Time
Period: | Triassic | Epoch: | Early/Lower Triassic |
Stage: | Olenekian | 10 m.y. bin: | Triassic 1 |
Key time interval: | Smithian | ||
Age range of interval: | 251.30000 - 247.20000 m.y. ago |
Stratigraphy
Local section: | Wadi Alwa I | Local bed: | 117A | ||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: Wadi Alwa I. The maximum dimension is at least 100 m. It is tabular preserving about 25 m of strata, mostly red limestone. The strata dip easterly at a low
angle. |
Lithology and environment
Primary lithology: | lithified argillaceous "limestone" |
Lithology description: 'red rocks, but different from the Hallstatt-type limestones, being nodular and of a marly nature.' | |
Environment: | basinal (carbonate) |
Geology comments: 'From a lithofacies standpoint these rocks are more comparable with the 'Ammonitico Rosso'. The Ammonitico Rosso facies, like the Hallstatt, is restricted to the Tethys but the typical occurrences are Jurassic, not Triassic.
The environment indicated by this facies was probably not exactly like that of the Halltstatt limestones, but was perhaps influenced by the presence of fine-grained terrigenous sediment.' |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | taxonomic analysis |
Collection method comments: Localities at Wadi Alwa were found in the winter of 1980-1981 by members of an expedition organized by Imperial College, London. The party included G. Loftus and G. Nichols. In 1984 the writers spent three days studying three localities at Wadi Alwa. |
Metadata
Database number: | 73249 | ||
Authorizer: | M. Aberhan, M. Clapham | Enterer: | S. Nurnberg, M. Clapham |
Modifier: | M. Clapham | Research group: | marine invertebrate,vertebrate |
Created: | 2007-06-07 02:08:47 | Last modified: | 2015-09-14 13:28:48 |
Access level: | the public | Released: | 2007-06-07 02:08:47 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
24596. | E. T. Tozer and T. J. Calon. 1990. Triassic ammonoids from Jabal Safra and Wadi Alwa, Oman, and their significance. In: Robertson, A. H. F., Searle, M. P. & Ries, A. C. (eds) The Geology and Tectonics of the oman Region Geological Society, London, Special Publication (49)203-211 [M. Aberhan/S. Nurnberg] |
Secondary references:
56322 | M. B. Koot, G. Cuny, M. J. Orchard, S. Richoz, M. B. Hart and R. J. Twitchett. 2015. New hybodontiform and neoselachian sharks from the Lower Triassic of Oman. Journal of Systematic Palaeontology 13:891-917 [M. Clapham/M. Clapham/M. Clapham] |