THE FRASNIAN-FAMENNIAN BOUNDARY IN THE VOLGOGRAD VOLGA REGION BY PALYNOLOGICAL DATA

The boundary between Frasnian and Famennian stages in the Volgograd Volga region is represented by threesection types. The first type of these boundary sections is widely spread on the Russian Platform in the areas with a break insedimentation occuring between Frasnian and Famennian stages, i.e. between the Livenian horizon of the Frasnian stage andthe Zadonian horizon of the Famennian stage. The second type is represented by more complete sections with the Volgogradianhorizon overlying the Livenian one. The Volgogradian horizon is represented by Corbulispora viminea - Geminospora vasjamicapalynozone. The third type has been recently identified by palynological data in the western flange of the Pre-Caspian depression(Mantsourova, 2000a). It is represented by incomplete stratigraphic sections with the erosive surface of the Semilukian horizonof the Middle Frasnian substage overlapped by the structures of various ages: the Evlanov-Livenian sediments of the Frasnianstage or Volgogradian sediments of the Famennian stage.

Project Supported:

Clc Number:

Q913.84