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Potassium-argon dating can date materials

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It is based on measurement of the product of the radioactive decay of an isotope of potassium K into argon Ar. Our editors will review what you've submitted, and if it meets our criteria, we'll add it to the article.
The details are best pursued in a dedicated text like McDougall and Harrison. But the decay of potassium has multiple pathways , and detailed information about each of these pathways is necessary if potassiun-argon decay is to be used as a clock. But geologists project a much smaller distance between the points at the time of the impact because of measured sea floor expansion. The measurements were done by the argon-argon method. These each have 19 protons and 21 neutrons in their nucleus. A third piece of evidence came from age measurements of shocked zircon crystals which were found in the K-T layer as far away as Colorado and Saskatchewan.

K–Ar dating

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Potassium Argon Dating Multiple argon extractions can be performed on a sample in several ways.
The results from a laser probe can be plotted in several graphical ways, including a map of a grain showing lateral argon distribution. Total fusion is performed using a laser and results are commonly plotted on probability distribution diagrams or ideograms. J value uncertainty can be minimized by constraining the geometry of the standard relative to the unknown, both vertically and horizontally. This page was last edited on 11 December , at Other large impact craters such as the Manson crater in Iowa dated to 74 My were examined carefully as candidates for the cause of the extinction, but none were close to the critical time.
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