Baisal, Bed 8 (Permian of Azerbaijan)

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, gray, white, cherty/siliceous limestone

• Light gray to white, massive and thick-bedded with rare chert nodules

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 94934: authorized by Matthew Clapham, entered by Matthew Clapham on 01.04.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Stauriida - Waagenophyllidae
Wentzellophyllum (Armeniaphyllum) cf. densicolumnatum, Ipciphyllum sp.
Ipciphyllum sp. Hudson 1958 horn coral
 Stauriida - Kepingophyllidae
Szechuanophyllum armenicum n. sp.
Szechuanophyllum armenicum n. sp. Kropatcheva 1989 horn coral
Foraminifera
 Ammodiscoidea - Ammodiscidae
Glomospira "sp. 1"
Glomospira "sp. 1" Rzehak 1895
Tubothalamea
 Miliolida - Cornuspiridae
Cornuspira baissalensis
 Miliolida - Hemigordiopsidae
Multidiscus arpaensis
Foraminifera
  -
Neodiscus sp.
 Endothyroidea - Endothyridae
Neoendothyra dzuongi, Neoendothyra caobangensis, Neoendothyra eostaffelloidea, Neoendothyra minuta
 Fusulinina - Pachyphloiidae
Pachyphloia aff. gracilis
 Fusulinoidea - Schwagerinidae
Pseudofusulina quasiregularis, Chusenella sofjae, Chusenella ex gr. tingi, Chusenella tumefacta, Chusenella cheni, Chusenella alpina, Chusenella ex gr. caucasica, Chusenella dorashamensis
Chusenella dorashamensis Rosovskaya 1965
 Palaeotextularoidea - Biseriamminidae
Dagmarita chanakchiensis, Globivalvulina graeca, Globivalvulina "sp. 1"
Dagmarita chanakchiensis Reitlinger 1965
Globivalvulina "sp. 1" Schubert 1921
 Palaeotextularoidea - Palaeotextulariidae
Climacammina sp.
Climacammina sp. Brady 1873
 Lagenina -
Pseudolangella geranossensis, Pseudolangella dzhagadzurensis