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The localities, ranging in age from 1200 to over 1 million yr, include Newberry Craters, Oregon; Coso Hot Springs, California; Salton Sea, California; Yellowstone National Park, Wyoming; and Mineral Range, Utah. A number of factors including volcanic glass composition and exposuretemperature history must be known in order to relate hydration thickness to age.Obsidian hydration dating typically yields a range of ages for a single chronometric measurement, even after controlling for source chemistry and effective hydration temperature.Previously published data suggest that this range is due to hydration rate variations caused by variability in the concentration of intrinsic water, and specifically hydroxyl ions, in the obsidian.Different dating processes can sometimes have problems like that of the Hawaiian archaeology for a number of reasons since a large proportion of prehistoric material was perishable.Lithic technology was a core-flake reduction process that exhibited little temporal change.A NEW IAOS PUBLICATION: A new obsidian-related volume, Twenty Five Years on the Cutting Edge of Obsidian Studies, has recently been published by the International Association for Obsidian Studies (IAOS).To have a look at a sample or to buy a copy online through Pay Pal, click HERE.Although, organic materials as old as 100,000 years potentially can be dated with AMS, dates older than 60,000 years are still rare.Paleoanthropologists and archaeologists must always be aware of possible radiocarbon sample contamination that could result in inaccurate dates.These findings do not invalidate obsidian hydration as a chronometric technique, but they do suggest limits to the temporal resolution achievable.Archeologist don’t use faulty methods to date artifacts so why would obsidian hydration fall in the category when history has shown that this method has had many faults and so many variables that could throw off the accuracy?

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