Climate Variations and Changes in World History

Abstract

The results of hydro-environment researches into marine and lacustrine sediments revealed climatic variations which seem to have some relationships between turns in world history and climatic changes. In the Japan Sea and northeast Pacific off Kashima from the Late Glacial to the Holocene, diatom temperature, Td' frequency of warm-water species frequency of warm-and cold-water species 1 100, values show rhythmic fluctuations with durations of