Abstract
The late Holocene deposits in the lowlands are subdivided into three regional pollen assemblage zones, i. e. Quercus-Fagus zone, Cryptomeria-Fagus-Quercus zone, and Pinus zone in ascending order, based on the occurrences of the regional temperate trees. The ages for the base of each zone are older than ca 6, 000y. B. P. for the lower, 2, 700-2, 000 radiocarbon y. B. P. for the middle, and ca 1, 000y. B. P. for the upper. From a comparison with the previous studies on the mountainlands, it suggests that Cryptomeria and Pinus have spread mainly in the lowlands, and these have not made an striking invarsion upon the Fagus forests in the mountainlands.
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