“…The peak that is observed around 500 C represents the Hopkinson peak, which is related to the presence of single domain (SD) grains which reside in a superparamagnetic state just before reaching the Curietemperature and have therefore an increased magnetic moment (Collinson, 1983;Zhu et al, 1999); in multidomain (MD) grains this effect is less expressed. The Hopkinson peak was also observed in samples from other sections in this geographic region (Djerrab et al, 2012). However, it cannot be completely excluded that SD grains also formed partially during the measurement, because it is also observed in samples from level 3 (i.e.…”