Figure F27. The intensity (after 30-mT demagnetization) and MST susceptibility are shown for the interval from 395 to 414 mbsf, which includes Cryptochron 4r.2r-1. These were used to compute the relative paleointensity record, which illustrates a gradual decay in the field before the cryptochron, a collapse to zero in the transition zone, a return to stable but low paleointensity during the cryptochron, and another collapse to zero in the transition zone. Following this collapse, the geomagnetic field intensity recovered to a value similar to that at the onset of Chron 4r.2r.