Figure S1. Room-temperature mean susceptibility
(kmRT) and low-temperature mean
susceptibility (kmLT) of chalk
samples, indicating that paramagnetic and diamagnetic minerals are the
main contributors to the rock mean susceptibility (see Issachar et al.,
2018 for details). (A) kmLT versus
kmRT plot showing a linear correlation
with a slop of 3.3. (B)
kmLT/kmRTversus kmRT plot showing an average
amplification factor of 4.6 ± 0.4.