Abstract
Continuous angiosperm pollen records from the Lower Cretaceous sequence of the Sorachi and Yezo Groups in the Teshionakagawa area of northern Hokkaido revise the first appearance times of four angiosperm pollen types in Japan: monosulcate, trichotomosulcate, tricolpate and tricolporate. The study shows that monosulcate, trichotomosulcate and tricolpate pollen types are present from at least the Barremian, while tricolporate type pollen is present from the late Albian. Compared with the first appearance times of Europe, North and South America, Africa and Asia, these times are about the same or even a little earlier. Notably, these results indicate the presence of the eudicotyledons in the Barremian of eastern Asia.
