The magnetic susceptibility can be used for stratigraphic correlations between cores and in the frequency analyses of temporal series to detect sedimentary cycles. The magnetic susceptibility (k) measures the capability of the material to become magnetized and to produce a noise in the inducing fields. Knowing the magnetic susceptibility k (adimensional) and the density, is it possible to determine the mass susceptibility. Minerals could be diamagnetic (k « 0), paramagnetic (k » 0) or ironmagnetic (k »» 0). Paramagnetic mineral are iron and nickel, iron magnetic are the iron oxides (magnetite, hematite, ilmenite, maglemite) hydroxides ( limonite, goethite) and sulfurs (pyrite). For measuring the magnetic susceptibiliy a Bartington loop sensor, for full core, with 3 cms of horizontal resolution is used. It measures the value through all the core section.