Archaeomagnetic dating english heritage
This remanence also has an intensity of magnetisation that is proportional to the strength of the magnetic field at that time.
As it cools down, the magnetic grains acquire a direction of magnetisation that is the same as that of the Earth’s magnetic field at that time and an intensity of magnetisation that is proportional to the strength of that field. Archaeological material, however, does not have such implications and records the magnetic field more confidently, as the field recording process is different. Lake, marine and continental sediments are often not reliable for an accurate registration of the geomagnetic field, because of delayed recording due to complex sedimentation environment and magnetic mineralogy.Consequently older dates depend on having available archaeomagnetic directional and intensity records from previous studies of well-dated archaeological sites.Understandably, archaeologists usually request magnetic dating for sites that cannot be adequately dated by other means!