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
Hedenstroemia cf. himalayica
Cephalopoda - Ceratitida - Flemingitidae
Flemingites cf. griesbachi
Chondrichthyes - Synechodontiformes
Polyfaciodus pandus Koot and Cuny 2014
Koot et al. 2015
Safrodus tozeri Koot and Cuny 2014
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]