Obsidian hydration dating range

In order to transform the hydration rim value to a calendar age, the rate of the diffusion of water into the glass must be determined or estimated. 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). Four rim measurements are typically recorded for each artifact or examined surface. Obsidian-Hydration Dating: Its Past, Present, and Future Application in Mesoamerica. Narrow rinds (under approximately two microns) are usually examined under a higher magnification.

Craig will still be maintaining his close association with Northwest Research but will be redirecting his focus to the U. Obsidian Source Catalog and to a variety of obsidian and FGV-related research projects. WEBSITE UPDATE: As part of the lab transition to new ownership, we're in the process of gradually moving pieces of the website around and you may occasionally run into some inconsistencies or links that don't quite take you quite where expected.

He is interested in Archaeological Dating because it allows archaelogists to understand how old certain artifacts are and Obsidian Hydration is an important part of doing that.

INTRODUCTION | PREPARATION METHODS | REFERENCES The obsidian hydration dating method was introduced to the archaeological community in 1960 by Irving Friedman and Robert Smith of the U. 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.

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.

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.

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