Geomagnetic dating of rocks is possible because garmin c550 updating bluetooth firmware
Archaeomagnetic dating measures the magnetic polar wander.
Therefore, you would use archaeomagnetic dating to date the last time the firepit was heated above the Curie point temperature.
By using another dating method (dendrochonology, radiocarbon dating) to obtain the absolute date of an archaeological feature (such as a hearth), and measuring the direction of magnetism and wander in the clay today, it is possible to determine the location of the magnetic north pole at the time this clay was last fired.
This is called the virtual geomagnetic pole or VGP.
The archaeologist then records the location of magnetic north on the cube, after the plaster hardens.
The vertical and horizontal placement of the sample is also recorded.