Baisal, Bed 13: Wordian, Azerbaijan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Endothyridae
Endothyra minima
Biseriamminidae
Globivalvulina sp. Schubert 1921
Pachyphloiidae
Pachyphloia aff. ovata Lange 1925
Schwagerinidae
Chusenella caucasica
Chusenella ex gr. sinensis Sheng 1963
Rugosofusulina sp. Rauser-Chernousova 1937
unclassified
Pseudolangella geranossensis
Tubothalamea - Miliolida - Cornuspiridae
Cornuspira baissalensis
Strophomenata - Productida - Productellidae
Ogbinia dzhagrensis Sarycheva 1965
Strophomenata - Strophomenida - Rugosochonetidae
Neochonetes armenicus Sokolskaja 1965
unclassified
Reitlingeria vediensis
Anthozoa - Stauriida - Kepingophyllidae
Szechuanophyllum baissalense
Anthozoa - Stauriida - Waagenophyllidae
? Wentzellophyllum ex gr. gnomeinse
Wentzellophyllum (Armeniaphyllum) vediense Kropatcheva 1989
see common names

Geography
Country:Azerbaijan
Coordinates: 39.6° North, 45.1° East (view map)
Paleocoordinates:8.5° South, 41.3° East
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Permian Epoch: Guadalupian
Stage: Wordian 10 m.y. bin: Permian 4
Key time interval: Wordian
Age range of interval: 266.9 - 264.28 m.y. ago
Stratigraphy
Formation:Arpa
Stratigraphic resolution:group of beds
Stratigraphy comments: Basal unit of the Midian stage of the Tethyan timescale. Kotlyar et al. (1989) identified two fusulinid zones, the lower Yangchienia thompsoni and the upper Chusenella abichi. In central Iran, Chusenella abichi occurs with Neoschwagerina margaritae (Leven, 1998), suggesting a Wordian age for the entire Arpa Formation.
Lithology and environment
Primary lithology:gray lithified "limestone"
Secondary lithology: lithified argillaceous "limestone"
Lithology description: Gray limestone, finely crystalline, thick-bedded to massive, interlayered with argillaceous limestone.
Environment:carbonate indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:94936
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:B. Allen Research group:marine invertebrate
Created:2010-04-01 15:29:00 Last modified:2020-05-18 09:21:35
Access level:the public Released:2010-04-01 15:29:00
Creative Commons license:CC BY
Reference information

Primary reference:
31759. G. V. Kotlyar, Y.u. D. Zakharov, G. S. Kropatcheva, G. P. Pronina, I. O. Chedija and V. I. Burago. 1989. Evolution of the latest Permian biota: Midian regional stage in the USSR 1-184 [M. Clapham/M. Clapham]