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We thank the Lake Suigetsu Scientific Drilling Team led by Y. Yasuda; M Nishimura for the macrofossils collection from sediments; and E. R. M. Druffel and three anonymous reviewers for comments on the manuscript. This work was funded primarily by the Grant-Aid for Scientific Research (04214116) from the Ministry of Education, Science, and Culture (Japan) and partly by the Toyota Foundation (96-A-232).
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