Of the 26 lava flows that were sampled and analyzed, 18 of them gave expected results. Eight rocks yielded unrealistic dates, which were either too old because of the presence of excess 40Ar (5 of them) or too young (negative ages) because of the presence of excess 36Ar (3 of them).
The details on the 8 anomalous samples are listed in Table 2 of Dalrymple (1969, p.
As further discussed in Dalrymple and Lanphere (1969, p. 91-92), Dalrymple concludes that excess argon is rare in volcanic rocks. B., 1991, The Age of the Earth, Stanford University Press, Stanford, California, USA.
In addition, excess argon is even less of a problem with Ar-Ar dating, where excess argon can often be distinguished from radiogenic argon and its effects eliminated (Mc Dougall and Harrison, 1999, p. , Snelling failed to properly quote the 'apparent K-Ar dates' from Table 2 in Dalrymple (1969, p. That is, Snelling mistakenly listed the concentrations of 40Ar (in 10 to the -12 moles/gram) for the Hualalai, Mt. Lassen, and Sunset Crater samples as their apparent K-Ar dates!!
4603), once the xenoliths were removed, the remaining matrix provided an expected date of 'zero years' (also see: Fresh Lava Dated as 22 Million Years Old).
For other studies comparing lots of dates your best bet is large scale timescale reconstructions like this one which will compare dozens if not hundreds of individual dates.
Because radiometric dating utterly refutes their biblical interpretations, young-Earth creationists (YECs) are desperate to undermine the reliability of these dating methods.
Thus Dalrymple’s data is not consistent with a young Earth whatsoever.
Indeed, if Dalrymple’s data is representative, 3 times out of 26 the K-Ar method will give a too young date (though by only an extremely trivial amount for a rock that is really millions of years old).
51), which is reproduced at Ar-Ar Dating Assumes There is No Excess Argon? Rahmani, 1990, 'Location of Extraneous Argon in Granulitic-facies Minerals: A Paired Microprobe-laser probe 40Ar/39Ar Analysis,' Chem.