Very Short Period Geomagnetic Excursion 18,000 yr BP

Counter-clockwise motion of paleomagnetic directions 24000 years ago at Mono Lake, California.

“…In Hawaii, the paleomagnetic vector tended to remain in one plane, unlike the continuous looping motion described here, and may have been related to changes in the orientation of the main dipole. In records of the past 30000 years, other workers have found large paleomagnetic departures at several localities, some of which were suggestive of polarity events (BONHOMMET and ZAHRINGER, 1969;MORNER et al, 1971;BARBETTI and MCELHINNY, 1972;CLARK and KENNETT, 1973;NAKAJIMA et al, 1973). Whether they are the result of dipole or non-dipole fluctuations is not known, but the elusive nature of these excursions suggests that some may be geomagnetic phenomena of less than world-wide extent.…”

A geomagnetic reversal in the latest Brunhes epoch discovered at Shibutami, Japan.

“…In Japan, an excursion at 18,000 years B.P. found in the sediment core from the Lake Biwa was reported by NAKAJIMA et al (1973) andYASKAWA et al . (1973).…”