New GSSP

A new paper which defines and describes the Sakmarian GSSP. The Sakmarian Stage represents a critical time interval because the Late Paleozoic Ice Age reached its acme during this time. After extensive studies, we herein use the First Appearance Datum (FAD) of the conodont Mesogondolella monstra within the lineage from M. uralensis→M. monstra→ M. manifesta at Bed 26/3 of the Usolka section in the southern Urals, Russia, as the primary signal for the base-Sakmarian GSSP. Read more in Chernykh, V V, Chuvashov, B I, Shen, S-Z, Henderson, C M, Yuan, D-X, and Stephenson, M H. 2020. The Global Stratotype Section and Point (GSSP) for the base-Sakmarian Stage (Cisuralian, Lower Permian). Episodes. 2020; 43(4): 961-979