Magnetostratigraphy
The magnetostratigraphy is a stratigraphic approach based on the recognition of magnétozones, of the sedimentary units diachrones carrying a signal paleomagnetic]]. The terrestrial magnetic field knows inversions of more or less frequent polarity on a geological time scale, inversions recorded in the sediments through indicators such as magnetic minerals.
The magnetostratigraphy coupled with the absolute Datation of specific events appeared very useful in the establishment of a relative chronology, because the magnetic signal is independent of the medium, total and precise. However, it is Binaire and sensitive to deteriorations, in particular diagenetic. In addition, there exist periods of calm magnetic where the resolution becomes bad.
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