Fifty years of obsidian hydration dating in archaeology

19 Aug

Obsidian obeys the property of mineral hydration, and absorbs water, when exposed to air, at well defined rate.

When an unworked nodule of obsidian is initially fractured, there is typically less than 1% water present.

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.

To measure the hydration band, a small slice of material is typically cut from an artifact.Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.This then can be used to deduce the sequence of events and processes that took place or the history of that brief period of time as recorded in the .Dating is not necessary to demonstrate that evolution is a fact.Chronological sequence is all that is really required.