Types of radioactive decay dating
One possibility for the accelerated decay comes with the possibility of variable speed of light.
A date that disagrees with that interpretation is dismissed as an anomaly.
In these cases, lava of a known age of no more than several thousand years (and in one case, no more than ten years) had argon in it when it formed, so that the rock was calculated by K-Ar dating to be millions of years old, even though it was known to be only thousands of years old.
Numerous fossils have been found in strata inconsistent with the evolutionary model of Earth's history.
As any first-year student of algebra soon learns, a single equation with two unknown variables cannot be solved.
In fact, the above formula is far too simple, because it assumes that the amount of daughter isotope was zero at start.
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His book, The Mythology of Modern Dating Methods, documents approximately 200 quotes by secular geologists indicating problems with the various dating methods.