Where: Armenia (39.9° N, 44.9° E: paleocoordinates 8.2° S, 41.1° 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 limestone
Size classes: macrofossils, microfossils
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: taxonomic analysis
PaleoDB collection 110798: authorized by Matthew Clapham, entered by Matthew Clapham on 13.06.2011
Creative Commons license: CC BY (attribution)
Taxonomic list
Tubothalamea | |
Foraminifera | |
Langella "sp. 2" Sellier de Civrieux and Dessauvagie 1965 | |
Chusenella sp. Hsu 1942 | |
Rhynchonellata | |
"Nordathyris nucleolus" = Notothyris nucleolus
"Nordathyris nucleolus" = Notothyris nucleolus Kutorga 1842 "Nordathyris" nucleolus (Kutorga) a mistake
| |
Septospirigerella baissalensis Grunt 1965
Septospirigerella applanata Grunt 1986 | |
"Acosarina avushensis" = Orthotichia avushensis
"Acosarina avushensis" = Orthotichia avushensis Sokolskaja 1965 | |
Strophomenata | |
Ogbinia dzhagrensis Sarycheva 1965
Ogbinia vediensis Kotlyar 1989 | |
Marginifera magniplicata Huang 1932 | |
Chonostegoides ogbinensis Sarycheva 1965 |