Archaeomagnetic dating range

Alph-95: circle of confidence A measure of the uncertainty expressing the likely maximum difference in angle between the true magnetisation direction and that estimated from measurements.

An alpha-95 value greater than 5° is generally considered to represent a poor precision, while values less than 2.5° are considered to indicate a good precision.

It is important to note that the size of the alpha-95 value is related in part to the number of specimens that are measured; a smaller alpha-95 can be obtained if more samples are measured.

archaeomagnetic dating range-60

Antiferromagnetism A form of ferromagnetism where the crystalline material contains two oppositely and equally magnetised sublattices so that the net magnetism will be zero.

If the two sublattices are not magnetised in exactly opposite directions, a weak magnetism can be created and is referred to as canted antiferromagntism.

An example of a canted antiferromagnetic mineral is haematite.

Archaeomagnetic dating Archaeomagnetic dating uses the ability of certain materials to record the Earth's magnetic field (geomagnetic field) to provide a date.

The Earth's field changes in both strength (intensity) and direction over time.

If the magnetism recorded within an archaeological material is compared with a record of the changes in the Earth's ancient field (geomagnetic field ), a date can be produced.

Archaeomagnetic dating is a derivative dating method.

Bayesian statistics The statistical theory developed from the theorem of the Reverend Thomas Bayes.

The premise of Bayesian statistics is to incorporate prior knowledge, along with a given set of current observations, in order to make statistical inferences.

Tags: , ,