No. 29: Sep-Oct 1993
K.L. Verosub has reported very steep geomagnetic inclinations in 120,000- year-old sediments in California. The mean inclination in these deposits ranged from 62° to 66°. Because this episode lasted several thousand years, Verosub believes that it opens to question the interpretation of other paleomagnetic data, where it is assumed that samples represent enough time for the geomagnetic field to have averaged out to a geocentric axial dipole.
(Verosub, Kenneth L.; "An Episode of Steep Geomagnetic Inclination 120,000 Years Ago," Science, 221:359, 1983.)
Comment. The gist of this rather technical article is that all the scenarios of crustal plate motion may have to be modified substantially.