Comparative paleofloristics of the Albian-early Paleocene in the Anadyr-Koryak and North Alaska subregions,Part 3: Comparison of floras and floristic changes across the Cretaceous-Paleogene boundary

Floras characterizing comparable evolutionary stages in the Anadyr-Koryak and North Alaska subregions of the North Pacific show some essential distinctions despite their similarity in general. Factors responsible for appearance of their distinctive features were most likely the paleoclimatic difference between the subregions and the constrained or even interrupted trans-Beringia migration of plants in particular intervals of geological history. Floras of both subregions survived the Cretaceous-Paleogene boundary crisis without essential consequences for their evolution, and amplitude of floristic changes across the boundary was not greater than by evolutionary changes in the crisis-free Late Cretaceous. Evolution of the North Pacific floras near this boundary has been likely controlled by the long-term paleogeographic and paleoclimatic changes and by plants evolution and migration.