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note
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We especially thank G. Comer and W. S. Broecker for their tremendous and generous support of our work. We thank H. Wang, Y. Fong, and L. Tu for stable isotope analyses and Y. Xie, S. He, J. Cao, Z. Wang, J. Zhan, and D. Yu for assistance with fieldwork. Supported by NSF grants ESH0214041, ESH9809459, and MR10116395; a Comer Science and Education Foundation Grant (CC8); National Science Foundation of China grants 40328005 and 40231008; and grants from the Ministry of Land and Resources and the Ministry of Science and Technology of China.
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