Where: Armenia (39.7° N, 45.2° E: paleocoordinates 8.4° S, 41.4° E)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Arpa Formation, Wordian (266.9 - 264.3 Ma)
• 7 m thick.
•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: 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 97391: authorized by Matthew Clapham, entered by Matthew Clapham on 24.07.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Nodosariata | |
Tubothalamea | |
Foraminifera | |
Nankinella sp. Lee 1933
Kahlerina sp. Kochansky-Devide 1955 | |
Pachyphloia aff. ovata Lange 1925 | |
Anthozoa | |
Ipciphyllum persicum Douglas 1936 horn coral
Wentzellophyllum sp. Hudson 1958 horn coral | |
Szechuanophyllum armenicum Kropatcheva 1989 horn coral
Szechuanophyllum transcaucasicum Kropatcheva 1989 horn coral | |
Rhynchonellata | |
Phricodothyris asiatica Chao 1929 | |
Martinia ex gr. warthi Waagen 1883 | |
Strophomenata | |
Richthofenia caucasica Licharew 1928 | |
Ogbinia sp., "Krotovia jisuensiformis" = Echinauriella jisuensiformis
Ogbinia sp. Sarycheva 1965
"Krotovia jisuensiformis" = Echinauriella jisuensiformis Sarycheva 1965 | |
Chonostegoides armenicus Sarycheva 1965 | |
Orthothetina sokolskajae Kotlyar 1989 |