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This series of dated positions is known as the "archaeomagnetic reference curve." (Stacey Lengyel, 2010.

81–3090.) So how do scientists use the earth's wandering magnetic field to date archaeological sites? Certain clays have a naturally high iron (Fe) content.

Klein 1993 Archaeomagnetic dating on the Great Plains.

Sources for the term include the references listed on the front page of the Dictionary, and the websites listed in the sidebar.

This process, in which the rotation of a planet with an iron core produces a magnetic field, is called a dynamo effect.

The Earth's magnetic core is generally inclined at an 11 degree angle from the Earth's axis of rotation.

Since its original release in 2006, the structure and function of the database have been updated and a significant number of data have been added.

This glossary entry is part of the Dictionary of Archaeology.

Archaeomagnetic dating is a method of dating iron-bearing sediments that have been superheated—for example, the clay lining of an ancient hearth. When these clays are heated to high temperatures, the iron in them aligns with the earth’s magnetic field at that moment.

Archaeomagnetic dating works because the earth’s magnetic field "wanders," continually changing its position in response to changes in the flow of liquid iron in the planet's core. As the clay cools, the alignment of the iron “fixes,” preserving a record of the magnetic field at a specific time in the past.

By tracking and cross-dating past changes in the location of the magnetic field, geophysicists have reconstructed a series of magnetic polar positions extending back more than 2,000 years. At archaeological sites, hearths constructed of iron-bearing clays are ideal for archaeolomagnetic sampling because they were subjected to repeated hot firings.

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