Pollenanalytical Study of the Kawakami Lake Deposits in Nagano Prefecture, Japan

Abstract

In this paper, the writer treated pollen fossils and plant remains collected from sediments of pleistocene dammed-up lake formed at the foot of the Yatsugatake volcanoes. The mother formations of these fossils seems to be forests of the uppermost of montane zone or the lowermost of sub-alpine zone. But considering the tendency to increase or decrease of each taxon, it seems that the pollen diagram indicates the effect of reconstruction of the mother formation after the destruction by volcanic activities. This conclusion leads to the proposition that one must pay attention to the influence of "plant succession" when interpret a pollen diagram obtained from rapidly deposited sediments.