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How does obsidian hydration dating work

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Omg, I need to move there. The obsidian hydration dating method was introduced to the archaeological community in by Irving Friedman and Robert Smith of the U. Geological Survey Friedman and Smith The potential of the method in archaeological chronologic studies was quickly recognized and research concerning the effect of different variables on the rate of hydration has continued to the present day by Friedman and others. Edgeplay When a new surface of obsidian is exposed to the atmosphere, such as during the manufacture of glass tools, water begins to slowly diffuse from the surface into the interior of the specimen. When this hydrated layer or rind reaches a thickness of about 0. Hydration rims formed on artifacts can vary in width from less than one micron for items from the early historic period to nearly 30 microns for early sites in Africa Michels et al. Formation of the hydration rim is affected not only by time but also by several other variables.

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In spite of research efforts spanning four decades, archaeo- logical applications of obsidian hydration as an independent dating technique have not all been suc- cessful e. Evans and Meggers ; McGrail et al. Since thermal cells have become more readily available. The approach recommended for using obsidi- an hydration as an independent chronometric technique is to first deploy thermal cells at a few depths within a site, then interpolate as necessary to estimate the effective hydration temperature for any depth where an obsidian artifact that might be dated has been recovered Stevenson et al.

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Obsidian hydration dating is a widely used method of determining the age of flaked obsidian by measuring the thickness of the hydration rind on a sample. All obsidian absorbs water into its surface.

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The "moving wall" represents the time period between the last issue available in JSTOR and the most recently published issue of a journal. Moving walls are generally represented in years. In rare instances, a publisher has elected to have a "zero" moving wall, so their current issues are available in JSTOR shortly after publication. In calculating the moving wall, the current year is not counted. For example, if the current year is and a journal has a 5 year moving wall, articles from the year are available.

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