136 - Dulankara section (Ordovician of Kazakhstan)

Also known as Nitikin Locality 136

Where: Kazakhstan (44.7° N, 75.4° E: paleocoordinates 14.9° S, 74.9° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Climacograptus caudatus - Climacograptus morrisi graptolite zone, Degeres Member (Dulankara Formation), Katian (453.0 - 445.2 Ma)

• Dulankara Stage. Popov & Cocks (2006: txt. f. 3) show that this is the Degeres member.

•Late Caradoc age is defined by the underlying occurrence of the graptolite Pseudoclimacograptus scharenbergi in the uppermost part of the underlying Anderken Formation (Nikitin 1972; Popov et al. 1999; Text-fig. 2), which is characteristic of the Climacograptus caudatus Biozone, the local equivalent of the Climacograptus clingani Biozone.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified siltstone

• The calcareous algae in the Akkol Member and the occasional dasyclad algae in the Degeres Member suggest deposition within the photic zone, but in less turbulent environments than the Otar Member, although the selective orientation of the pelmatozoan stems and brachiopod shells suggest that the sediments were occasionally affected by strong storms or tidal currents.
• Key on Txt. Fig. 2

Size class: macrofossils

Preservation: coquina

Primary reference: L. E. Popov and L. R. M. Cocks. 2006. Late Ordovician brachiopods from the Dulankara formation of the Chu-ili range, Kazakhstan: their systematics, palaeoecology and palaeobiogeography. Palaeontology 49(2):247-283 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 185961: authorized by Pete Wagner, entered by Pete Wagner on 30.05.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Strophomenida - Sowerbyellidae
Sowerbyella akdombakensis Klenina 1984
 Strophomenida - Leptellinidae
Shlyginia extraordinaria Rukavishnikova 1956
 Strophomenida - Glyptomenidae
Platymena tersa Popov and Cocks 2006
? Glyptomenoides sp. Popov and Cocks 2006
 Strophomenida - Strophomenidae
"Strophomena orthonurensis" = Strophomena (Strophomena) orthonurensis
"Strophomena orthonurensis" = Strophomena (Strophomena) orthonurensis Misius 1986
 Atrypida - Atrypinidae
Qilianotryma suspectum Nikiforova et al. 1982
 Orthida - Plectorthidae