Where are obsidian dating labs

Variations in this data may point to errors anywhere in the process, which is why all the steps of preparation are recorded in detail.

K-Ar analyses cost several hundred dollars per sample and take a week or two.

These steps help remove as much atmospheric Ar from the sample as possible before making the measurement.

Next, ​the mineral sample is heated to melting in a vacuum furnace, driving out all the gas.

OOL processes several thousand specimens each year from a variety of archaeological contexts, primarily in western North America.

The rock sample to be dated must be chosen very carefully.

Any alteration or fracturing means that the potassium or the argon or both have been disturbed.

allow for comparison of the amount of hydration that develops on single source specimens as well as comparison of the amount of hydration developed on several obsidian sources processed simultaneously.

Induced hydration studies are especially valuable in that they reveal variation or homogeneity in hydration band development within and between obsidian sources.

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