Upper Permian and Triassic of the Precaspian Depression: stratigraphy and palaeogeography

The stratigraphic serie of the Precaspian Depression during the Upper Permian and the Triassic is analysed. Data from seismic sections and from numerous boreholes are used. The lithological composition and the palaeontological content are cleared for all the time interval. Three palaeogeographical maps are drawing for the Kazanian, the Lower Triassic and the Middle Triassic. The evolution of palaeoenvironments is restored in relation to the tectonic events and the fluctuations of the Boreal Sea and the Palaeo-Tethys Ocean.