Geomagnetic dating of rocks is possible because

The lower part of the paleosol sequence shows a clearly defined reverse polarity magnetization followed by geomagnetically unstable transitional field and ended by normal polarity remanence.Considering the K-Ar datings available at the bottom of the sequence, observed polarity changes most probably correspond to the Matuyama-Brunhes transition.Geomagnetic reversals are global phenomena that require several stratigraphic correlation and dating methods for their firm identifications.For about 50 years the paleomagnetists attempted to acquire as many detailed records as possible using the magnetic memory of sediments and lava flows.The record so preserved is called Thermal Remnant Magnetism (TRM).Because complex oxidation reactions may occur as igneous rocks cool after crystallization, the orientations of the Earth's magnetic field are not always accurately recorded, nor is the record necessarily maintained.

The study of paleomagnetism has demonstrated that the Earth's magnetic field varies substantially in both orientation and intensity through time.Paleomagnetists study the ancient magnetic field by measuring the orientation of magnetic minerals in rocks and sediments, then using similar methods to geomagnetism determine what configuration of the Earth's magnetic field may have resulted in the observed orientation.Paleomagnetism can be divided into two fields: The study of paleomagnetism is possible because iron-bearing minerals such as magnetite may record past directions of the Earth's magnetic field.In addition, there is also evidence which is specifically opposed to the moving continent theory. The outstanding evidence for continental drift is the manner in which the coastal outline of eastern South America appears to somewhat match that of the west coast of Africa.Other continental outline matches have also been devised, but, as a rule, they require greater stretches of the imagination to work out.

Search for geomagnetic dating of rocks is possible because:

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