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Learn more about earth's shifting magnetism in Earth's Inconstant Magnetic Fielda Science News article on NASA's website.

Eric Blinman, the director of the New Dafing Office of Archaeological Acrhaeomagnetic, explains archaeomagnetic dating in this Time Team America PBS video.

At archaeological sites, hearths constructed of iron-bearing clays are ideal for archaeolomagnetic sampling because they were subjected to repeated hot firings.

The iron in the clay realigned with every sufficiently archaeomangetic fire, so it is the last hot fire in a hearth that archaeologists are able to date.

By tracking and cross-dating past changes in archaeomagnetic dating example location of the magnetic field, geophysicists have reconstructed a series of magnetic polar positions extending back more than 2, years.

Overview of Methods Superposition Stratigraphy Dendrochronology Radiocarbon C14 Radiometric Dating Methods Obsidian Hydration Dating Paleomagnetic/Archaeomagnetic Luminescence Dating Methods Amino Acid Racemization Fission-track Dating Ice Cores Varves Pollens Corals Cation Ratio Fluorine Dating Patination Oxidizable Carbon Ratio Electron Spin Resonance Cosmic-ray Exposure Dating This is an excellent overview of dating methodologies, and is a chapter in a textbook on Archaeology.Southwest Archaeomagnetic Archaeomagnetic dating example Curve. Journal of Archaeological Science It's all about clay.Certain clays have archaeomagnetic dating example naturally high iron Fe content.And when the field flips it also tends to become very weak.What currently has geophysicists like us abuzz is the realization that the strength of Earth’s magnetic field has been decreasing for the last 160 years at an alarming rate.

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