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Obsidian hydration dating
Potentially, a chronometric dating method based on the fact that obsidian, or volcanic glass, progressively develops a thin chemically altered outer layer due to the absorption of water. The thickness of this hydration layer is directly proportional to the amount of time since the rock was formed or since a fresh surface was exposed to the elements. Since the rate of hydration varies between samples from different volcanic sources, this technique could arguably be considered relative rather than chronometric.
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- Industry/Domain: Anthropology
- Category: Physical anthropology
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