[aerohead]

Originally Posted by freebeard

archive.org/details/ChanThomasTheAdamAndEveStoryTheHistoryOfCataclysms 1993FullUNCENSORED

Here it is 'uncensored' but not unexpurgated. I haven't read it all myself, but my understanding is that the geological record doesn't reflect a pole flip if it flips back again.

The geologic record does record excursions, with jumps back to the original polarity.
For a long time, the US NAVY submariners used their own top-secret, sea-floor magnetometer data as a means to navigate under water.
They've declassified 'some' but not all of it.