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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.

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Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.To measure the hydration band, a small slice of material is typically cut from an artifact.Twenty years after cofounding and directing the obsidian laboratory at Sonoma State University, Tom established Origer's Obsidian Laboratories in 2002.When an unworked nodule of obsidian is initially fractured, there is typically less than 1% water present.Over time, water slowly diffuses into the artifact forming a narrow "band," "rim," or "rind" that can be seen and measured with many different techniques such as a high-power microscope with 40-80 power magnification, depth profiling with SIMS (secondary ion mass spectrometry), and IR-PAS (infra red photoacoustic spectroscopy).Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner.

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