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Only one weathering chronometer is employed widely at the present time.
Its record of time is the thin hydration layer at the surface of obsidian artifacts.
In a specific environment the process of is the time since the surface examined was freshly exposed.Whether in a dry Egyptian tomb or buried in wet tropical soil, a piece of obsidian seemingly has a surface that is saturated with a molecular film of water.Consequently, the key to absolute dating of obsidian is to evaluate for different temperatures.Sometimes human observation can be maintained long enough to measure present rates of change, but it is not at all certain on a priori grounds whether such rates are representative of the past.
This is where radioactive methods frequently supply information that may serve to calibrate nonradioactive processes so that they become useful chronometers.
To serve as geochronometers, the records must be complete and the accumulation rates known.
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