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 97390: authorized by Matthew Clapham, entered by Matthew Clapham on 24.07.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Tubothalamea | |
Foraminifera | |
Dunbarula sp. Ciry 1948 | |
Chusenella abichi, "Chusenella xarlensis" = Chusenella schwagerinaeformis
"Chusenella xarlensis" = Chusenella schwagerinaeformis Sheng 1963 | |
Cephalopoda | |
Pleuronautilus dzhagadzurensis Zakharov 1989 | |
Gastropoda | |
Euomphalidae indet. White 1877 snail | |
Strophomenata | |
Chonostegoides armenicus Sarycheva 1965
Chonostegoides ogbinensis Sarycheva 1965 |