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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.
Such variability exists within any given obsidian source, and even within any particular specimen.
This dating method works by measuring the ratio of oxidizable carbon to organic carbon.
If the sample is freshly burned there will be no oxidizable carbon because it would have all been removed by the combustion process. Prehistoric and Historic Excavations at Site 9Gw347, Annistown Road Improvement Project, Gwinnett County, Georgia.
By measuring the ratio of oxidized carbon to organic carbon (the OCR) and applying it to the following equation the age of the sample can be determined with a very low standard error. Data Recovery Excavations at the Maple Swamp (38HR309) and Big Jones (38HR315) Sites on the Conway Bypass. Burr 1999 Point/Counterpoint: Failure to Discriminate: Querying Oxidizable Carbon Ratio (OCR) Dating. The Steward: Collected Papers on Texas Archeology -94. Submitted to the Gwinnett County Department of Transportation, Lawrenceville, Georgia and Moreland Altobelli Associates, Atlanta, Georgia. 1999 Cronologia Obtenida por la Tasa del Carbono Organico Oxidable (OCR) en Markatch Aike 1 (Cuenca del Rio Chico, Santa Cruz). The greatest experience I've had in a very long time.I had no idea of the richness of culture that the area holds.Join over 15,000 people who will enjoy the spectacle and wonder of ancient petroglyphs in all their glory!With tours of magnificent Native American rock art dating back 10,000 years, traditional Native American music and dance, an educational lecture series, as well as the Petroglyph Park Street Fair.