Changes of Taxonomical Composition of Late Jurassic-Early Cretaceous Palynofloras of Bureya Basin, Russia

The changes of taxonomical composition of the Late Jurassic-Early Cretaceous palynofloras are revealed, in the upper stream of Bureya River in Bureya Basin. The palynofloras are dominated as follows: the Berriasian one by ferns (Cyatheaceae, Dicksoniaceae, Osmundaceae), Classopollis and bisaccate pollen; the Valanginian-Hauterivian one by ferns (Cyatheaceae, Dicksoniaceae), Ginkgocycadophytus and bisaccate pollen; the Barremian one by ferns (Cyatheaceae, Dicksoniaceae); the Aptian one by ferns (Cyatheaceae, Dicksoniaceae, Gleicheniaceae) and Ginkgocycadophytus; and the Albian one by ferns (Schizaeaceae) and bisaccate pollen. In the Albian the floral diversity raises with the angiosperms appearing.