Where: Azerbaijan (39.6° N, 45.1° E: paleocoordinates 8.5° S, 41.3° 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, fine-grained, gray, cherty/siliceous 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: biostratigraphic analysis
PaleoDB collection 94932: authorized by Matthew Clapham, entered by Matthew Clapham on 01.04.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Anthozoa | |
Ipciphyllum flexuosa horn coral | |
Tubothalamea | |
Cornuspira sp. Schultze 1854 | |
Foraminifera | |
Glomospira "sp. 1" Rzehak 1895 | |
Pseudolangella sp. Sellier de Civrieux and Dessauvagie 1965 | |
Globivalvulina sp. Schubert 1921
Dagmarita chanakchiensis Reitlinger 1965 | |
Yangchienia compressa Ozawa 1927 | |
Abadehella sp. Okimura and Ishii 1975 | |
Tetrataxis sp. Ehrenberg 1854 | |
Geinitzina postcarbonica Spandel 1901 | |
Diplosphaerina aff. mastophora Derville 1950 |