Vendomdalen Member, Vikinghøgda Formation, Svalbard Lower Triassic: Olenekian, Norway
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Phylloceratida
- Ussuritidae
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Popovites occidentalis
Tozer 1965
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Cephalopoda
- Ceratitida
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Bajarunia ex gr. euomphala
(Keyserling 1845)
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| Ammonoid | ||||||||||
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Cephalopoda
- Ceratitida
- Keyserlingitidae
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Keyserlingites sp.
Hyatt 1900
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| Ammonoid | ||||||||||
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Keyserlingites subrobustus
(Mojsisovics 1886)
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Cephalopoda
- Ceratitida
- Sibiritidae
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Parasibirites cf. elegans
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| Ammonoid | ||||||||||
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Cephalopoda
- Ceratitida
- Olenikitidae
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Svalbardiceras spitzbergense
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Bivalvia
- Ostreida
- Posidoniidae
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Posidonia aranea
Tozer 1961
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| Bivalve | ||||||||||
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unclassified
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Michrystridium sp. marine palyn
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Gordonispora fossulata microspore
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Pechorosporites disertus microspore
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Rewanispora foveolata microspore
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Jerseyiaspora punctispinosa microspore
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Striatoabieites sp. microspore
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Tasmanites sp. marine palyn
Newton 1875
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Pteridopsida
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Striatella seebergensis microspore
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Polypodiopsida
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Verrucosisporites sp. microspore
Potonie and Kremp 1954
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unclassified
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Lueckisporites junior microspore
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Illinites chitonoides microspore
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Cyclotriletes pustulatus microspore
Mädler 1964
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| see common names | ||||||||||
Geography
| Country: | Norway |
| Coordinates: | 78.0° North, 23.0° East (view map) |
| Paleocoordinates: | 42.2° North, 10.4° East |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | local area |
Time
| Period: | Triassic | Epoch: | Early Triassic |
| Stage: | Olenekian | 10 m.y. bin: | Triassic 1 |
| *Period: | Early/Lower Triassic | *Epoch: | Scythian |
| *International age/stage: | Late/Upper Olenekian | ||
| Key time interval: | Olenekian | ||
| Age range of interval: | 251.2 - 247.2 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Sassendalen | Formation: | Vikinghøgda | Member: | Vendomdalen |
| Stratigraphic resolution: | member |
Lithology and environment
| Primary lithology: | dolomitic,gray,yellow silty mudstone | ||
| Lithology description: 94 meters thick Dolomite beds and nodules are common, with a few silty interbeds. Calcite concretions are the most abundant in the upper part of the Lusitaniadalen Member but do also occur in the Vendomdalen member, but with different carbonate mineralogy. 18 meters above the base of the member a prominent bivalve-rich dolomite bed is present which can be correlates the two sections. The member consits of silty, dark grey laminated mudstone, thin- to medium-bedded with more or less silty, yellow weathering, dolomite beds and nodules. A clear shift from grey to dark gery mudstone takes place at the lower bouderay, and the yellow weathering dolomite beds are distinctive of the Vendomdalen Member throughout central Spitzbergen. The dolomitic beds may be up to 1.5 meters thick, but most are 10-30 cm thick. Dolomitic nodules, some of them septarian, are up to tens of centimetres in diameter, flattened nodules may reach several metres in horizontal extent, but generally only 0.5 m in thickness. Rare calcite concretions occur near the top of the member. From the bivalve bed, that occurs upward at ridges of several meltwater creeks, the section consists of several 3 to 12 m thick, faintly coarsening upward units, grading from laminated shale to silty mudstone, capped with dolomite beds, sometimes silty or sandy, or consisting of dolomite lenses. The dolomite beds consits of sucrose, ferrous dolomite and were formed relatively late in diagenesis. The upper 50 m consists of plana laminated silty grey mudstone with thin dolomite beds. At the top is a pronounced silty/sandy dolomite bed. The bed shows some ripple lamination. Above the top bed, very dark grey shale with small phosphate nodules is referred to the Botheheia Formation. Seven metres above the base of the Botheheia Formation there is a dolomitic siltstone bed, which represents a local marker in the lowermost part of this formation in the Sassendalen area. | |||
| Environment: | marine indet. | Tectonic setting: | foreland basin |
| Geology comments: The member represents distal shelf deposits, below wave base, with accumulation of marine derived organic material in a low oxic environment. | |||
Taphonomy
| Modes of preservation: | body,mold/impression,adpression,original silica |
| Size of fossils: | macrofossils,microfossils |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | bulk,chemical,mechanical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 31369 | ||
| Authorizer: | C. Looy | Enterer: | W. Puijk |
| Modifier: | W. Puijk | Research group: | paleobotany,paleoentomology |
| Created: | 2003-05-09 06:26:13 | Last modified: | 2003-05-09 09:35:54 |
| Access level: | the public | Released: | 2003-05-09 06:26:13 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8474. | A. Mørk, G. Elvebakk, A.W. Forsberg, M.W. Hounslow, H.A. Nakrem, J.O. Vigran, and W. Weitschat. 1999. The type section of the Vikinghøgda Formation: a new Lower Triassic unit in central and eastern Svalbard. Polar Research 18(1):51-82 [C. Looy/W. Puijk/W. Puijk] |