Yolkin E.A.; Kim A.I.; Weddige K.; Talent J.A.; House M.R.(2001)
The agreed boundary for the Lower Devonian basal Emsian stage Global Stratotype Section and Point (GSSP) is in a section at the Zinzil'ban Gorge of the Kitab State Geological Reserve, south-southeast of Samarkand, Uzbekistan, ...