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These artifacts of occupation can yield the magnetic declination from the last time they were fired or used.

Archaeomagnetic dating was described in the 1992 publication “Paleomagnetism: Magnetic Domains to Geologic Terranes.” By Robert F. Archaeomagnetic dating requires an undisturbed feature that has a high likelihood of containing a remnant magnetic moment from the last time it had passed through the Curie point.

Each of the samples is measured in a spinner magnetometer to determine the thermal remanent magnetism of each sample.

The results are statistically processed and an eigenvector is generated that shows the three-dimensional magnetic declination that will yield a location for the North Pole at the time of the last thermal event of the feature.

Unetizen is an independent company and has no affiliation with Wikimedia Foundation.An approach to improving the largest source of uncertainty, the independent dating, is proposed and applied to the British Iron Age, resulting in 145 directions from currently available databases being updated with revised ages and/or uncertainties, and a large scale reassessment of age assignments prior to inclusion into the Magnetic Moments of the Past and GEOMAGIA50 databases.From the significantly improved dataset a new archaeomagnetic dating curve for the UK is derived through the development of a temporally continuous geomagnetic field model, and is compared with previous UK archaeomagnetic dating curves and global field models.Within these weaker areas the local directions and intensities change gradually (secular variation).A compass does not point to the true North Pole but to direction that is a function of the North Magnetic Pole and the local secular variation to yield a magnetic declination.But in the commercial sector, fieldwork is a typical next stage.Here, we not only look at excavation, but also some non-intrusive methods, such as surveying earthwork sites and buildings, and the various standards that any work in these areas should achieve.In the previous chapter, we described some of the desk-based research methods that can precede fieldwork.We looked at mapping, archives and aerial photographs, and the ways in which these sources can be combined to respond to the desk-based assessment typically stipulated in a project ‘brief’. Of course, all of the methods associated with desk-based assessment can stand alone as a study in their own right, without any intention of following this up with fieldwork.These samples are marked for true north at the time of collection.The samples are sent to an Archaeomagnetic Laboratory for processing.