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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.

Prehistoric rinds can vary from less than 1 micron (µm) to more than 50 µm, depending on the length of time of exposure.

Comparisons are made between the results of obsidian hydration and other dating methods.different from that of the remainder of the obsidian.

Experimental and empirical data indicate that this hydration band grows roughly as the square root of time (measured in years).

Their initial work focused on obsidians from archaeological sites in western North America.

The use of Secondary ion mass spectrometry (SIMS) in the measurement of obsidian hydration dating was introduced by two independent research teams in 2002.

Obsidian Hydration Dating (OHD) is a technique that can be used over a wide age range; dates have been reported in the age range from 200 to 100,000 years ago. Values are plotted from data provided by Vargas et al. When a chipped surface of obsidian is exposed it slowly acquires a hydration rim by diffusion of water in to the artefact.

On the island Rapa Nui (Easter Island) obsidian-hydration has been used to date habitation sites (Vargas et al. The thickness of the rim depends on age, the type of obsidian and burial temperature.

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Close behind is the 1887 flood, which killed anywhere from 900,000 to 2 million people, and a 1931 flood (part of a massive number of floods that year) that killed 1–4 million people.