Obsidian Dating in West Mexican Archeology

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Abstract
Experience in applying obsidian dating to one delimited region suggests some ways in which the archeologist can establish a hydration rate and estimate correction factors. Once this is done, use of the method provides an immediate guide to practical decisions about the choice of sites for excavation, and in addition contributes directly to several important areas of analysis of collections. Obsidian dating, like other dating methods, is not a universal tool for the resolution of all chronological problems in all areas. In some regions obsidian dating is of little or no value. Hence, as with other methods, some discrimination in use is needed, and areas of uncertainty remain to be clarified. However, despite its limitations, the obsidian method yields very consistent results in such areas as western Mexico where it can be used effectively. Obsidian dating is a significant addition to archeological techniques and will be widely applied in future archeological programs. It may be of particular value for those sites from which no other direct evidence of age (such as radiocarbon dates) is available.