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Obsidian is too brittle to be used as a pounding (e.g., axe, adze) or grinding tool.Obsidian obeys the property of mineral hydration, and absorbs water when exposed to air.So after over a year of travelling the country, working on various projects of evil (or more accurately, puppet shows, tv, and films) I sit in my lab wondering where the hell I go from here. Olivr and I have moved again, so the current plotline in the videos would be skewed. The most important of these are chemical composition and temperature, although water vapor pressure and soil alkalinity may also play a role in some contexts. The effects of these variables have often been summarized and will not be discussed further here (Michels and Tsong 1980; Friedman and Obradovich 1981; Freter 1993; Hull 2001; Stevenson et al., 1993, 1998, 2000; Friedman et al. 1999, Ridings 1996; see Skinner and Tremaine 1993 for additional references). 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 under 40-80 power magnification.

Please remember that all dating methods, even those termed "absolute," are subject to margins of error. That is a very small amount of possible error range. Modern studies almost always use two or more methods to confirm dating work and to build confidence in the results obtained.

So I bring the question to you, the people still here. Or do you just want me to shut up and film already?

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Overview of Methods Superposition Stratigraphy Dendrochronology Radiocarbon C14 Radiometric Dating Methods Obsidian Hydration Dating Paleomagnetic/Archaeomagnetic Luminescence Dating Methods Amino Acid Racemization Fission-track Dating Ice Cores Varves Pollens Corals Cation Ratio Fluorine Dating Patination Oxidizable Carbon Ratio Electron Spin Resonance Cosmic-ray Exposure Dating This is an excellent overview of dating methodologies, and is a chapter in a textbook on Archaeology.

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Once a hydration layer has been measured, it can be used to determine the relative ages of items or, in some circumstances, can be converted into an estimated absolute age.

In order to transform the hydration rim value to a calendar age, the rate of the diffusion of water into the glass must be determined or estimated.

INTRODUCTION | PREPARATION METHODS | REFERENCES The obsidian hydration dating method was introduced to the archaeological community in 1960 by Irving Friedman and Robert Smith of the U. When a new surface of obsidian is exposed to the atmosphere, such as during the manufacture of glass tools, water begins to slowly diffuse from the surface into the interior of the specimen.

The potential of the method in archaeological chronologic studies was quickly recognized and research concerning the effect of different variables on the rate of hydration has continued to the present day by Friedman and others. In Chronometric Dating in Archaeology, edited by R.

To measure the hydration band, a small slice of material is typically cut from an artifact.

This sample is ground down to about 30 micrometers thick and mounted on a petrographic slide.