Where: Azerbaijan (39.6° N, 45.1° E: paleocoordinates 8.5° S, 41.3° E)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Arpa Formation, Wordian (266.9 - 264.3 Ma)
• 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.
• group of beds-level stratigraphic resolution
Environment/lithology: lithified, gray limestone
Size class: macrofossils
Primary reference: 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]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 94939: authorized by Matthew Clapham, entered by Matthew Clapham on 01.04.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Foraminifera | |
Abadehella sp. Okimura and Ishii 1975 | |
Pseudofusulina sp., Chusenella abichi, Chusenella ventricosa, Chusenella brevis, Chusenella sinensis
Pseudofusulina sp. Dunbar and Skinner 1931
Chusenella brevis Rosovskaya 1965
Chusenella sinensis Sheng 1963 | |
Pachyphloia aff. ovata Lange 1925 | |
Strophomenata | |
Ogbinia dzhagrensis, "Krotovia jisuensiformis" = Echinauriella jisuensiformis
Ogbinia dzhagrensis Sarycheva 1965
"Krotovia jisuensiformis" = Echinauriella jisuensiformis Sarycheva 1965 | |
Chonostegoides armenicus Sarycheva 1965
Chonostegoides ogbinensis Sarycheva 1965 | |
Orthothetina sokolskajae n. sp., Orthothetina vediensis, "Orthothetina arakeljani" = Meekella arakeljani
Orthothetina sokolskajae n. sp. Kotlyar 1989
Orthothetina vediensis Sokolskaja 1965
"Orthothetina arakeljani" = Meekella arakeljani Sokolskaja 1965 |