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Figure 2: Distribution of Erlitou culture sites in the Yiluo region, showing the locations of spade production sites in relation to dolomite source. Oolitic dolomite outcrops are embedded in the dolomite deposits. Sites are surveyed by the Yiluo Team and Erlitou team. Spade production sites: 1. Zhaiwan; 2. Huizui; 3. Xiahousi; 4. Xikouzi.