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 | |
Amblysiphonella sarytchevae Zhuravleva 1965 demosponge |