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Potassium-40 on the other hand has a half like of 1.25 billion years and is common in rocks and minerals.This makes it ideal for dating much older rocks and fossils.So Curtis and others redated the KBS tuff using selected pumice and feldspar samples, and obtained an age of 1.82 million years.This new date agreed with the appearance of the new skull.

Using new samples of feldspar and pumice they ‘reliably dated’ the tuff at 2.61 million years, which agreed nicely.Tests by other scientists using paleomagnetism and fission tracks confirmed the lower date.So by 1980 there was a new, remarkably concordant date for the KBS tuff, and this became the one that was widely accepted.Using the potassium-argon method, Fitch and Miller were the first to measure the age of the tuff.Their result of 212–230 million years did not agree with the age of the fossils (elephant, pig, ape and tools) so they rejected the date.

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