The First Detailed δ13Соrg Record in the Asselian Deposits of Western Verkhoyanie, Northeastern Russia

The first detailed δ13Сorg record in the lower part of the Permian of Western Verkhoyanie was obtained based on the study of 103 samples of siltstone rocks from the Srednyaya Dielendzha Section, which is the stratotype of the Khorokyt Formation and the Khorokytian Regional Stage. Carbon isotope correlation with the previously studied Kubalakh Section of Northern Verkhoyanie showed that in the stratotype of the Kubalakh Formation from the lower reaches of the Lena River, the Jakutoproductus budnikovi Beds and the Jakutoproductus talchanensis Beds fall on a break in the outcrop. The paleontologically uncharacterized upper part of the Srednyaya Dielendzha Section belongs to the upper half of the Jakutoproductus insignis Zone. For the first time, chronostratigraphic relationships between the biostratigraphic units of Verkhoyanie and the conodont zones of the boundary Asselian-Sakmarian deposits of the Southern Urals have been established using chemostratigraphic methods. Carbon isotope data indicate that the Khorokytian Regional Stage of Verkhoyanie fully corresponds to the Asselian stage of the International Chronostratigraphic Chart.