The fitted results of SAR models for each of the six communities (see Table 1) using sequential sampling order of each sample (see Methods for details).

Data related to OSL age determinations of 33 samples from the Yaoxian, Jingchuan and Huanxian sections.

The fitted results of SAR models for each of the six communities (see Table 1) using randomized sampling order of each sample (see Methods for details).

1Statistics for data from the highest-resolution shell are shown in parentheses. 2 R sym =(ΣΣ|Ihkl−〈I〉|)/(ΣIhkl), where the average intensity <I> is taken...