TJ197, Gundara valley: Kungurian, Tajikistan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata
- Athyridida
- Athyrididae
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Posicomta gundarensis
Grunt 1986
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Rhynchonellata
- Terebratulida
- Pseudodielasmatidae
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Fredericksolasma rhomboidalis
(Smirnova and Grunt 2003)
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Fredericksolasma lata
(Licharew 1939)
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see common names |
Geography
Country: | Tajikistan |
Coordinates: | 38.8° North, 70.9° East (view map) |
Paleocoordinates: | 28.0° North, 67.6° East |
Basis of coordinate: | stated in text |
Geographic resolution: | outcrop |
Time
Period: | Permian | Epoch: | Cisuralian |
Stage: | Kungurian | 10 m.y. bin: | Permian 2 |
Key time interval: | Kungurian | ||
Age range of interval: | 279.30000 - 272.30000 m.y. ago |
Stratigraphy
Formation: | Gundara | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Kubergandian |
Lithology and environment
Primary lithology: | shelly/skeletal lithified cherty/siliceous "limestone" |
Environment: | reef, buildup or bioherm |
Geology comments: Our preferred palaeoenvironmental reconstruction is one of agglutinated microbial reefsto cluster reefs (e.g., Riding, 2002). The microbial reefs are formed by the cyanobacterial microbialites Tubiphytes and Archaeolithoporella, with a few large cavities filled by botryoidal cements and subordinate skeletal elements. The cluster reefs are made by in-place conical skeletons of Gundaria insolita that were adjacent but not always in contact with the substrate. These reefs were likely laterally extensive despite their low topographic relief, which is consistent with the mostly bedded nature of the Gundara Formation. The abundance of matrix and the reduced cementation and bioerosion suggest muddy depositional environments, which were probably deeper and more turbid than those of the Safetdara Formation. |
Taphonomy
Modes of preservation: | body,replaced with silica |
Size of fossils: | macrofossils |
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Collection method comments: Repository: Palaeontological Museum of the Department of Earth Sciences "A. Desio", University of Milan, Italy |
Metadata
Also known as: | Reef 4121 | ||
Database number: | 182706 | ||
Authorizer: | M. Clapham | Enterer: | M. Clapham |
Modifier: | M. Krause | Research group: | marine invertebrate |
Created: | 2016-11-22 14:54:00 | Last modified: | 2017-08-28 09:25:13 |
Access level: | the public | Released: | 2016-11-22 14:54:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
60899. | L. Angiolini, M. Campagna, L. Borlenghi, T. Grunt, D. Vachard, G. Vezzoli, I. Vuolo, J. Worthington, A. Nicora and A. Zanchi. 2016. Brachiopods from the Cisuralian–Guadalupian of Darvaz, Tajikistan and implications for Permian stratigraphic correlations. Palaeoworld 25:539-568 [M. Clapham/M. Clapham] |