A major theoretical issue in studies of the cultural ecology of Central Mexico has been the role of irrigation in the evolution of the state in that area. A major methodological problem has been the location and dating of prehistoric canal systems. A recent discovery near Xalostoc, of a stratified canal system (representing three distinct periods) in the exposed profiles of contemporary adobe extraction pits, offers an ideal situation for dating of prehistoric canals. All three are apparently Pre-Coyotlatelco in date and the settlement history suggests that some of them are contemporary with Teotihuacan.
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Sanders et al. (1977) studied this question.
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