Importance of angiosperm pollen for the stratigraphy of Upper Cretaceous and Lower Paleogene deposits and botanical-georaphical provinces at the boundary between the Cretaceous and Tertiary systems.
Reference:
Zaklinskaya,E.D. (1962)
Importance of angiosperm pollen for the stratigraphy of Upper Cretaceous and Lower Paleogene deposits and botanical-georaphical provinces at the boundary between the Cretaceous and Tertiary systems. International Palynological Conference,1st,Tucson Akademya Nauk SSR,Instute Geology
P. 105- 113