Geologicheskii Vestnik

The results of a comprehensive paleontological study of the Sakmarian-Artinskian boundary interval of the “Dalniy Tulkas” section are presented. Conodonts, ammonoids, foraminifera are described and their evolutionary development is considered. The results of a comprehensive paleontological study of the micro- and macrofauna from the Sakmarian-Artinskian boundary deposits of the “Dalniy Tulkas” section are presented. The “Dalniy Tulkas” section claims to be the Global stratotype of the lower boundary (“golden nail”) of the Artinskian Stage of the Permian system of the International Stratigraphic Chart. The distribution of conodonts, ammonoids, and foraminifers was studied. The lower boundary of the Artinskian Stage was established by the appearance of the cosmopolitan species Sweetognathus whitei (Rhodes) in the evolutionary line S. binodosus – S. anceps – S. whitei. A complex of ammonoids with Daraelites, Eothinites, Popanoceras, as well as Neopronorites skvorzovi (Tchernow), Uraloceras involutum (Voinova), U. gracilentum Ruzhencev, and Popanoceras annae Ruzhencev were identifi ed above the Sakmarian-Artinskian boundary. Moreover, the last four species are markers of the Sakmarian-Artinskian border. Beds with Uraloceras involutum were fi rst identifi ed in “Dalniy Tulkas” section for the fi rst time. The distribution of characteristic schubertella-fusulinida complexes, and assemblages of small foraminifers is shown in the section. Changes in the taxonomic composition of foraminifera over time are analyzed.

“Dalniy Tyulkas” section, Permian system, Sakmarian Stage, Artinskian Stage, conodonts, ammonoids, foraminifera, International Stratigraphic Chart

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