Neutron activation analysis of a large sample of obsidian artifacts from Early Horizon and First Intermediate sites in the Basin of Mexico has allowed identification of the geologic sources that were exploited. Combining the geologic source data with obsidian manufacturing data in a diachronic fashion permits one to suggest a series of obsidian utilization stages that correlate with growing cultural complexity.
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Boksenbaum et al. (1987) studied this question.
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