Dalniy Tyulkas Section (Southern Urals, Russia): A Potential Candidate For The Gssp To Define The Base Of The Artinskian Stage In The Global Chronostratigraphic Scale, New Data

The Dalniy Tyulkas section is represented by thick marine mixed carbonate-siliciclastic deposits of Lower Permian Age (Artinskian and Sakmarian Stages). The Dalniy Tyulkas section is proposed as GSSP for the lower boundary of the Artinskian Stage for International Geochronological Scale. A complex research of the Dalniy Tyulkas section (paleontological, lithological, geochemical, and paleomagnetic) was carried out for the first time. The lower boundary of the Artinskian stage is determined by the level of appearance of conodonts Sweetognathus whitei in the phylogenetic line Sweetognathus merrilli -> Sw. binodosus -> Sw. anceps -> Sw. whitei -> Sw. clarki. The diversity of fossil remains, the presence of numerous tuff interlayers, the accessibility of the section for further study and the possibility of a global correlation of the established boundary - all this allows us to propose the Dalniy Tyulkas Section as a stratotype of the lower boundary of the Artinian Stage.