Is it me but the water in my toilet bowl now swirls counter clockwise? Am i imagining this? It was always clockwise, wasn't it???
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I think the problem with our ability to estimate geological core samples is limited by carbon 14 dating inaccuracies. Organic matter needs to be located in the same strata as the reoriented ferrous materials that show one directionality of magnetic alignment over another. The issue is that the time can be estimated by the ratio of decay of the carbon-14 isotope vs the daughter isotope. This is all relied upon with the factor that the carbon-14 amount is consistent on this planet. Unfortunately, we have found that carbon-14 levels are artificially deposited by space debris that impacts the earth. Since the rate of additional carbon-14 deposit on the planet is unknown, it fouls up the calculations and makes the usage of carbon-14 aging unreliable.
The core and rock samples used to detect previous pole shifts did not rely on Carbon-14 dating, as inorganic materials cannot be dated that way...only organic materials (trees, bones, etc.) can be C-14 dated. The geologists who detected the pole shifts did so based on the directions that ferrous (iron, ergo magnetic) were pointing in situ when they were discovered. The ferrous samples pointed in different directions other than magnetic N-S at the time they were discovered.
Yes, this is how they determined there was a pole shift. The strata that the shifted ferrous samples were taken from were used to locate organic matter in the same approximate strata at a site that had organic matter in it. This is where they tested Carbon-14 for dating. Without any organic matter, they would have no way of determining the periodicity of the pole shifts.