This does not include dates from minerals that are thought to yield bad dates, or from igneous bodies with wide biostrategraphic ranges, where many dates are acceptable. Thus modern lava flows are not subject to the same mechanism of artificial increases in their K-Ar ages as are ancient ones. Most of the crew were Indian lascars.
Under favourable circumstances the isochron method may be helpful, but tests by other techniques may be required. Also, they do not get quickly buried by additional sediment.
This will make the sample appear artificially old right away. When one adds in the fact that many anomalies are unreported, which he gives evidence for, the true distribution is anyone's guess.
It had been noted that some minerals which yield such dates as beryl, cordierite, etc. At the start, let me clarify that my main concern is not the age of the earth, the moon, or the solar system, but rather the age of life, that is, how long has life existed on earth. If the minerals in the lava did not melt with the lava, one can obtain an age that is too old. My point was that the usual mixing test can only detect two sources. In fact, the argon in the magma may well be even higher, as it may concentrate near the top.
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