The pole revearsal that occurred concurrent with the flood de-magnetized MOST rocks, although many at puma punku still retain 'some' magnetism. I believe its one of the 'secrets' of 33* freemasons. Jokes on you, @sswagons.
I would look for another pole revearsal soon, I.e. next 3 years. If you're pre-trib rapture then no worries, if not you'd better find maps on 216' sea level rises before it all refreezes.