I think there is about 40,000 years before the next reversal ... wouldn't swear to it though.
Funny you should mention geo-fiz in connection with this. My first real job was for a company (now deceased) that developed devices for non intrusive corrosion monitoring/detection in pipelines. A small part of the system we developed is essentially the core of what the geo-fiz boys use.
It is just possible that dowsing would work from the same principles and this experience is why I never fully poo-poo'ed the idea totally.
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