Radiohalo dating website

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More successful was the Optically Stimulated Luminescence (OSL) method to date quartz crystals found in baked lake sediments incorporated into the ash (as xenoliths) and secured an age of around 40,000 years. Bennett and Alberto González-Huesca (2006) Human footprints in Central Mexico older than 40,000 years. Whether this has actually occured can usually be determined by plotting the data is a different way.[1] Leeman's paper contains quite a bit more data than Austin used, with sufficient scatter to suggest that the resulting isochron probably is either an "inherited" reflection of the mantle source age or has no significance at all.

The sample was taken from the working quarry, 200m south from where the footprints were found. However, Austin narrowed down the data set to flows which fell into a particular stratigraphic range -- "stages III and IV of Hamblin's later classification," said Austin (1988) -- and those selected data points fell quite close to a single line.

Austin simply assumes that the first explanation is correct and then he proceeds to use the 'presence' of 'excess argon' in his samples to question the reliability of all K-Ar dates on other rocks and minerals.

This is the logical fallacy of composition (Copi and Cohen, 1994).

It is not as if the British team pulled a date out of the air. A more extensive study of the upper lava flows, with 20 samples, was done by Leeman already in 1974.

He also claims that microscopes were used to scan for 'foreign particles' (xenocrysts? Of course, he and his assistants may have missed many of the xenocrysts if they were small.

Austin clearly ignores the possibility of contamination in the mass spectrometer (hypothesis #2) and the possibility that the phenocrysts in his samples may be much older than the 1986 AD eruption (hypothesis #3).

When this occurs, the daughter products will shoot out in opposite directions leaving distinct radiohalo tracks.

Daughter products along with size and color of tracks indicate exactly what the original parent element and isotope were.

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