Where: Armenia (39.7° N, 45.2° E: paleocoordinates 8.4° S, 41.4° E)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Arpa Formation, Wordian (266.9 - 264.3 Ma)
• 7 m thick.
•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 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: taxonomic analysis
PaleoDB collection 97387: authorized by Matthew Clapham, entered by Matthew Clapham on 24.07.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Foraminifera | |
Tetrataxis sp. Ehrenberg 1854 | |
Climacammina valvulinoides Lange 1925 | |
Globivalvulina aff. cyprica Reichel 1946 | |
Pachyphloia aff. ovata Lange 1925 | |
Rhynchonellata | |
Septospirigerella cf. baissalensis Grunt 1965 | |
Orthotichia sp. Hall and Clarke 1892 | |
Strophomenata | |
Ogbinia dzhagrensis Sarycheva 1965 |