FORAMINIFER ZONES OF THE CALLOVIAN STAGE IN THE LOWER VOLGA REGION

Abstract

Callovian stratigraphy is usually based on ammonites, while foraminiferal assemblages are correlated with the ammonite scale. Precisely this approach was used for elaborating the Callovian stratigraphic scale for the Russian Platform based on the foraminifer group of microorganisms, which was proposed by a team of paleontologists at meetings in Vilnius (1982) and Tbilisi (1984). During recent decades, the lower Callovian ammonite scale was subjected to some changes, which makes it necessary to revise stratification of this substage in the Russian Platform.