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Offers a variety of analytical services related to obsidian trace element characterization sourcing studies, obsidian hydration studies, and obsidian source.. Fig. 1. The spatial distribution of seven obsidian chemical groups at Glass Buttes according to Ambroz et al. 2001, redrawn from their Fig. 1. History. Obsidian hydration dating was introduced in 1960 by Irving Friedman and Robert Smith of the U.S. Geological Survey Their initial work focused on obsidians. Information on the major interest areas of the IAOS including obsidian hydration dating, obsidian characterization, geoarchaeological obsidian studies, obsidian and. How old is it? Over the 150 years of the discipline of scientific archaeology, researchers have used many different ways to determine how old an artifact or. D. DARLING, J. ANDREW 1996 PDF Recent Research on Obsidian Sources in the Southern Sierra Madre Occidental, Mexico. International Association for Obsidian. Is Dating Really Important? Index For This Page: I wish this page was unnecessary. Because of the distortions and lies spread by fundamentalists about scientific.... . Obsidian, or volcanic glass, is formed by the rapid cooling of silica-rich lava. Although its precise chemical composition varies from one outcrop to another, it. Figures draft version Figure 1. Color texture guide for obsidian. Figure 2. Roundness guide for obsidian nodules modified from Powers 1953.
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