Limitotipes of Lower Sakmarian and Artinskian stages boundary in the Urals

Abstract

The section Usolka and duplicating its section Dal’ny Tulkas (Bashkortostan) are proposed as the stratotypes of the Lower Sakmarian stage boundary and Lower Artinskian stage boundary of the International Stratigraphic scale. We give the description of sections with the indication of conodont, fusulinid and ammonoid level findings and the results of studying U-Pb geochronology as well as Sr, C, O isotopes.

Keywords

• стратотип границы
• сакмарский ярус
• артинский ярус
• конодонты
• фузулиниды
• аммоноидеи
• урал
• the stratotype of a boundary
• sakmarian stage
• artinskian stage
• conodonts
• fusulinids
• ammonoids
• the urals