Shales contain magnetic minerals generally at very low concentrations. In the early stages of diagenesis, inherited are altered, while nanominerals formed. this study, we proposed a study shales over stratigraphic thickness 1.3 km from borehole in Paris basin (Borehole EST 433, France), and same formation (Opalinus Clay) collected seven boreholes Jura molasse (Swiss). Magnetic measurements expe...