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When exposed to water that contains fluoride, a fluoride ion (F-) can replace a hydroxyl ion (OH-) in the bone mineral.

The resulting fluor-apatite is more stable than the original form, thus the fluoride content of a bone will increase over time if it is exposed to a solution containing fluoride ions.

Fluoride ions are present in trace amounts in most soils and groundwaters.

For example, JJA Worsaae used this law to prove the Three Age System.

For more information on stratigraphy and how it is used in archaeology, see the Stratigraphy glossary entry.

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