Baisal, Bed 8: Wordian, Azerbaijan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Ammodiscidae
Tubothalamea - Miliolida - Hemigordiopsidae
Tubothalamea - Miliolida - Cornuspiridae
unclassified
Schwagerinidae
Chusenella dorashamensis Rosovskaya 1965
Pachyphloiidae
Endothyridae
Palaeotextulariidae
Climacammina sp. Brady 1873
Biseriamminidae
Dagmarita chanakchiensis Reitlinger 1965
unclassified
Anthozoa - Stauriida - Waagenophyllidae
Anthozoa - Stauriida - Kepingophyllidae
see common names

Geography
Country:Azerbaijan
Coordinates: 39.6° North, 45.1° East (view map)
Paleocoordinates:5.0° South, 52.5° East (Wright 2013)
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,white lithified cherty/siliceous "limestone"
Lithology description: Light gray to white, massive and thick-bedded with rare chert nodules
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:94934
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:B. Allen Research group:marine invertebrate
Created:2010-04-01 15:13:43 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-04-01 15:13:43
Creative Commons license:CC0
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]