International symposium: "Evolution of permian marine biota," and problems concerning permian sections in the type region

The main results of the International Symposium "Evolution of Permian Marine Biota," are presented. The Artinskian to Ufimian part of the section at the Kozhim River (Polar Urals) is briefly described including its paleontological characteristics. Potentials for further study of Permian deposits in the Urals and possibilities of using the Uralian stages as international standards are discussed. Copyright © 1997 by MAHK Hayka/Interperiodica Publishing

Limitotipes of Lower Sakmarian and Artinskian stages boundary in the Urals

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

Dynamics of near-surface structures of Ural area in Upper Perm-Triassic time and tectonic division of crystal crust of the West Siberian geosyneclise

The provision of early mesozoic grabens (rifts) filled with terrigenous deposits and basalts of the Triassic in tectonic volume model of crystal crust is considered. Taking into account the similar analysis on the Upper Paleozoic granitization and arrangement of fields of hydrocarbons, which were made earlier, the causation of tectonics and magmatism with a deep structure of upper part of a lithosphere of Uural area of the West Siberian geosyneclise is emphasized. The common source of these phenomena caused by joint activity of a deep underearth in a Upper Permian-Triassic stage of development of the studied geological environment is offered

International symposium: "Evolution of permian marine biota," and problems concerning permian sections in the type region

The main results of the International Symposium "Evolution of Permian Marine Biota," are presented. The Artinskian to Ufimian part of the section at the Kozhim River (Polar Urals) is briefly described including its paleontological characteristics. Potentials for further study of Permian deposits in the Urals and possibilities of using the Uralian stages as international standards are discussed. Copyright © 1997 by MAHK Hayka/Interperiodica Publishing