Obsidian hydration relative dating

Obsidian hydration dating OHD is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian. Obsidian is a volcanic glass that was sometimes used as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through the process of flintknapping. Obsidian obeys the property of mineral hydration , and absorbs water when exposed to air. 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 a high-power microscope with power magnification b depth profiling with SIMS secondary ion mass spectrometry. In order to use obsidian hydration for absolute dating, the conditions that the sample has been exposed to and its origin must be understood or compared to samples of a known age e.
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Shasta-Trinity National Forest - History & Culture

Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site. Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating. Stratigraphy is the oldest of the relative dating methods that archaeologists use to date things. Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first. In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers. Cross-dating of sites, comparing geologic strata at one site with another location and extrapolating the relative ages in that manner, is still an important dating strategy used today, primarily when sites are far too old for absolute dates to have much meaning.
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Northwest Research Obsidian Studies Laboratory

Obsidian hydration dating OHD is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian. 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. Obsidian obeys the property of mineral hydration , and absorbs water , when exposed to air, at well defined rate. 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 power magnification b depth profiling with SIMS secondary ion mass spectrometry , and IR-PAS infra red photoacoustic spectroscopy. Geological Survey.
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We ask that you confirm directly with us before sending artifacts for analysis to verify that we can accept packages at our mailing address. We send out our best wishes to all and hope that you and your loved ones stay safe and healthy. If something changes in our ability to receive packages we will post an update here.
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