Obsidian hydration dating
Hydration Analysis of Obsidian Flakes Produced by Ishi During the Historic Period. Contributions of the University of California Archaeological Research Facility No.
Where In the World Does Obsidian Hydration Dating Work?
When a clearly defined hydration layer is identified, the section is centered in the field of view to minimize parallax effects.
Four rim measurements are typically recorded for each artifact or examined surface. Obsidian-Hydration Dating: Its Past, Present, and Future Application in Mesoamerica.
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).
Hydration rinds smaller than one micron often cannot be resolved by optical microscopy. The Failure of Obsidian Hydration Dating: Sources, Implications, and New Directions. In Advances in Obsidian Glass Studies, edited by R. Empirical Determination of Obsidian Hydration Rates from Archaeological Evidence. 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 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. In Chronometric Dating in Archaeology, edited by R.