A new obsidian hydration rate is proposed for archaeological obsidian derived from the Antelope Wells source area located along the international boundary between the United States and Mexico near the Antelope Wells border crossing in Hidalgo County, New Mexico. Prehistorically, obsidian from this source was used extensively in the region lying between Casas Grandes, Chihuahua and Lordsburg, New Mexico. As the Antelope Wells source is the only one occurring within this area the new rate should provide archaeologists working in the region with an accurate and reliable absolute dating method.
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