TJ197, Gundara valley: Kungurian, Tajikistan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Athyridida - Athyrididae
Posicomta gundarensis Grunt 1986
Rhynchonellata - Terebratulida - Pseudodielasmatidae
Fredericksolasma rhomboidalis (Smirnova and Grunt 2003)
Fredericksolasma lata (Licharew 1939)
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]