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When the crystal is looked at under a microscope, these discolourations appear as dark ringshence the name "pleochroic halo".
Few people realize it but all radiometric dating methods require making at least three assumptions.
This lower limit is at least concordant with the independently derived figure of 4.55 billion years for the Earth's actual age.
The only dating methods discussed (over and over) by evolution-believing scientists and the mass media are those that supposedly "prove" that the earth is billions of years old.
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Potassium is common in rocks and minerals, allowing many samples of geochronological or archeological interest to be dated.
Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built.
K-Ar dating was used to calibrate the geomagnetic polarity time scale.
Thermoluminescence testing also dates items to the last time they were heated.