Obsidian hydration dating lab

To measure the hydration band, a small slice of material is typically cut from an artifact.

We were able to make independent age estimates of each hydration reading based on radiocarbon dates and temporally diagnostic artifacts. Although there were some problems with small sample sizes, readings needed to be adjusted for elevation, and the readings are source specific, a very strong relationship accounting for nearly 90% of the total variation in the data set was found. This suggests that obsidian hydration dating (OHD) works very well in the SNR and is a viable means of independently estimating age. Residual values from our regression suggest that hydration age estimates are usually within 15% of the radiocarbon estimates. 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.

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