Progress and Prospects in Obsidian Hydration Dating.

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The result is a thin cross-section of the surfaces of the artifact.

The prepared slide is measured using an Olympus BHT petrographic microscope fitted with a video micrometer unit and a digital imaging video camera.

The hydration rate is typically established empirically through the calibration of measured samples recovered in association with materials whose cultural age is known or whose age can be radiometrically determined, usually through radiocarbon dating methods (Meighan 1976).

The hydration rate can also be determined experimentally, an approach that has shown increasing promise in recent years (Friedman and Trembour 1983; Michels et al. An appropriate section of each artifact is selected for hydration slide preparation.

Considerations of Hydration-rind Dating of Glass Artifacts: Alteration Morphologies and Experimental Evidence of Hydrogeochemical Soil-zone Pore Water Control.

In Current Directions in California Obsidian Studies, edited by Richard E. 48, University of California, Berkeley, California.

The location of the section is determined by the morphology and the perceived potential of the location to yield information on the manufacture, use, and discard of the artifact.

Two parallel cuts are made into the edge of the artifact using a lapidary saw equipped with 4-inch diameter diamond-impregnated .004″ thick blades.

In Advances in Archaeological Method and Theory, Volume 3, edited by M.

Experimentally Derived Hydration Rates in Obsidian Dating.

Hydration Analysis of Obsidian Flakes Produced by Ishi During the Historic Period. Contributions of the University of California Archaeological Research Facility No.