Geomagnetic dating of rocks is possible because updating apple tv on a mac
They now point to the location of magnetic north at the time the firepit is being heated.
Magnetism occurs whenever electrically charged particles are in motion.
Archaeologists collect archaeomagnetic samples by carefully removing samples of baked clay from a firepit using a saw.
A nonmagnetic, cube-shaped mold (aluminum) is placed over the sample, and it is filled with plaster.
Any changes that occur in the magnetic field will occur all over the world; they can be used to correlate stratigraphic columns in different locations.
This correlation process is called magnetostratigraphy. Lava, clay, lake and ocean sediments all contain microscopic iron particles.
Therefore, the magnetic north pole is at approximately an 11 degree angle from the geographic north pole.