Where: Azerbaijan (39.7° N, 45.1° E: paleocoordinates 8.4° S, 41.3° E)

• coordinate estimated from map

• outcrop-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: macrofossils

Primary reference: E. V. Boiko, G. V. Belyaeva, and I. T. Zhuravleva. 1991. Sphinktozoa Phanerozoya Territorii SSSR [Phanerozoic Sphinctozoa of the Territory of the USSR] 1-224 [W. Kiessling/B. Brenneis/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 95711: authorized by Matthew Clapham, entered by Matthew Clapham on 24.04.2010

Creative Commons license: CC BY (attribution)