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Size increase in Lower Yangzi rice phytoliths. (A) Measured horizontal length and vertical length of rice bulliform phytoliths from Majiabang period samples (M); (B) measurements from samples of the subsequent Songze (S) and Liangzhu (L) phases. The dashed oval represents the distribution of the Majiabang measurements. Data re-plotted from Zheng et al. (1994, 2004a, b) and Wang and Ding (2000).
