Middle-Late Jurassic foraminifers of the western Caucasus: Evolution of foraminiferal assemblages and some environmental aspects

Based on the analysis of distribution of Middle-Late Jurassic foraminifers of the western Caucasus in each particular paleotectonic zone, the evolutionary dynamics of foraminiferal assemblages and their relationships are reconstructed. The evolutionary rates of Callovian-Tithonian foraminiferal assemblages in the paleotectonic zones are considered against a background of facies changes. Common and distinctive features in the change of foraminiferal communities and facies at different stages of foraminiferal evolution and the quality of environments for the development of foraminiferal associations are recognized.