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 class: 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 110807: authorized by Matthew Clapham, entered by Matthew Clapham on 13.06.2011

Creative Commons license: CC BY (attribution)