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 and lithified, argillaceous 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 94937: authorized by Matthew Clapham, entered by Matthew Clapham on 01.04.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Foraminifera | |
Pachyphloia aff. ovata Lange 1925 | |
Geinitzina postcarbonica Spandel 1901 | |
Chusenella abichi, Chusenella ventricosa, Chusenella caucasica, Chusenella longa, Chusenella sinensis, Chusenella brevis
| |
Strophomenata | |
"Krotovia jisuensiformis" = Echinauriella jisuensiformis, Ogbinia dzhagrensis
"Krotovia jisuensiformis" = Echinauriella jisuensiformis Sarycheva 1965
Ogbinia dzhagrensis Sarycheva 1965 | |
Rhynchonellata | |
Septospirigerella baissalensis Grunt 1965 | |
Anthozoa | |
"Ufimia alternata" = Praetachylasma alternatum
"Ufimia alternata" = Praetachylasma alternatum Huang 1932 horn coral | |
Szechuanophyllum transcaucasicum n. sp. Kropatcheva 1989 horn coral | |
"Waagenophyllum indicum" = Waagenophyllum (Waagenophyllum) indicum
"Waagenophyllum indicum" = Waagenophyllum (Waagenophyllum) indicum Waagen and Wentzel 1886 horn coral | |
Ufimia elongata Grabau 1922 horn coral |