A comparative study of the Japanese pollen records to the oxgen and carbon-isotope/pollen records from the Arabian Sea, Bengal Bay and Andaman Sea suggests the following summer monsoon fluctuations since the last glacial age in Japan. Ca. 120,000-70,000 years B.P.; Monsoon is active. 70, OO0-50, OOO years B.P.; Monsoon is not active. 50,000-33,000 years B.P.; Monsoon is rather active. 33,000-12,000 years B.P.; Monsoon is not active. But from 28,000 to 25,000 years B.P. is slightly active. 12,000-10,000 years B.P.; Monsoon is to move active. after 10,000 years B.P.; Monsoon is active.
