Avush Gorge, Arpinskaya Gorizont (Permian of Azerbaijan)

Where: Azerbaijan (39.6° N, 45.2° E: paleocoordinates 8.5° S, 41.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Arpa Formation, Wordian (268.8 - 265.1 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 82113: authorized by Matthew Clapham, entered by Matthew Clapham on 23.07.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Demospongiae
 Agelasida - Sebargasiidae
Amblysiphonella sarytchevae Zhuravleva 1965 demosponge