ИСТИНА

The samples for palynological analysis were collected from seven outcrops and three boreholes located in central regions of the Russian Platform. Eight palynological assemblages were established. First one (palynoassemblage I) is characterized by dominance of pollen grains (over 54% of the total). The Bajoician age of the palynologiсal assemblage I is defined by presence of typical Bajoician species - Uvaesporites verrucosus, Neoraistrickia suratensis, Antulsporites verrucatus, Lycopodiumsporites intortivallus, and Dicthyophyllidites harrisii. The palynoassemblage II is distinguished by domination the spores (69%) over pollen (31%). Typical Lower Bathonian spores of Klukisporites variegatus, Staplinisporites caminus and Neoraistrickia rotundiformis were met. Amount of Classopollis (1,2%) is precious few here. Palynological assemblage III is characterized by predominance of spores of Gleicheniaceae (19%). The typical species for the Bathonian stage (Sestrosporites psevdoalveolatus and Callialasporites dampieri) are found. Five palynological assemblages were distinguished for the Callovian age. Palynoassemblage IV is defined by the prevalence of gymnosperm pollen over the spores. It should be noted the first appearance Gleicheniidites apilobatus and pollen grains of Cycadopites jansonii here. The amount of Classopollis is increased up to 35%. The palynoassemblage V is dominated by Classopollis pollen up to 46%. The Lycopodiumsporites caperatus and Alisporites grandis are found here for the first time. It is necessary to note that assemblage V consists of 50% algal species. The palynoassamblage VI indicates that pollen composition of the assemblage in the middle Callovian depends on the lithological component. The bissacate pollen grains dominate in the sands. Majority of Classopollis (up to 40%) is usually in the clays. The palynological assemblages VII and VIII are similar. Both assemblages are characterized by domination of Classopollis from 26% in the assemblage VII to 36% in the assemblage VIII. However last one is characterized by first appearance of Gleicheniidites angulatus and G. rasilis and by predominance of dinocysts (61%). Studied palynoassemblages could be used for the age determination of the deposits without invertebrate remains.