SILURIAN STRATIGRAPHIC SCALE FOR EAST SIBERIA

Principles of stratigraphic regionalizing and chronozonal characterist ics of global and regional stratigraphic scale for East Siberia are pr esented. The stratigraphic regionalizing resulted in recognition of fi ve subregions (North Taimyrskii, North Prieniseiskii, Tungusskii, Nyuy a-Berezovskii, and Irkutskii) and 15 stratigraphic areas (Middendorf, Norilsk, Turukhansk, Igarka, Kochumdek, Vorogovka, South Taimyr, Ledya nka, Maimecha, Moiero, Morkoka, Vilyui, Nyuya-Berezovka, nim, and Balt ura). The global scale is divided into stages and substages are subdiv ided into 54 global chronozones with indicated first and last occurren ce levels of guide fossils, such as graptolites, brachiopods, conodont s, and tabulates. The regional scale of East Siberia is divided into s ix horizons (Moiero, Khaastyr, Agidy, Khakoma, Tukal, and Postnichnyi) and 13 subhorizons ranging through 54 regional chronozones, whose str atigraphic intervals correspond to those of global chronozones. In Eas t Siberia, the first and last occurrence levels are established for gu ide species of graptolites, chitinozoans, acritarchs, cephalopods, tri lobites, brachiopods, scolecodonts, conodonts, bryozoans, tentaculites , ostracodes, gastropods, crinoids, rugoses, tabulates, stromatoporoid s, algae, pelecypods, vertebrates, chiolites, and conularians. Stratot ypes are selected for all chronozones (global and regional).