Potassium argon dating reliability

Why older dates would be found lower in the geologic column especially for K-Ar dating Back to top In general, potassium-argon dates appear to be older the deeper one goes in the crust of the earth. Some fossils are found in Precambrian rocks, but most of them are found in Cambrian and later periods. If one of these protons is hit by a beta particle, it can be converted into a neutron. Lava that cools underground cools much more slowly, and can form large crystals. For a full overview I recommend this book: Potassium volatilizes easily, is easily leached by water, and can migrate through the rocks under certain conditions. It is also being claimed that the standard deviations are not too large.

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Even the initial ratios of parent and daughter elements in the earth do not necessarily indicate an age as old as 4.

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K–Ar dating

K-Ar dates of 7 to 15 billion years have been recorded. The study by Funkhouser and Naughton was on the xenoliths, not on the lava. One archeological application has been in bracketing the age of archeological deposits at Olduvai Gorge by dating lava flows above and below the deposits. This is formed when lava is sticky and bubbles of gas in it explode. Any interpretation will reflect the interpreters presuppositions bias.

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