Processes affecting radiometric dating techniques newdatingsites org
The isotope potassium-40 (k-40) decays into a fixed ratio of calcium and argon (88.8 percent calcium, 11.2 percent argon).
Obviously, these eruptions took place very recently, after the Canyon’s layers were deposited ().
However, if one knows the scientific formula for interpreting these transitions, the results can be "highly precise" according to paleontologist Guy Narbonne (Kerr, 789).
The half-life of uranium-235 is 704 million years, while the half-life of uranium-238 is 4.5 billion years.
To date a radioactive rock, geologists first measure the “sand grains” in the top glass bowl (the parent radioisotope, such as uranium-238 or potassium-40).
They also measure the sand grains in the bottom bowl (the daughter isotope, such as lead-206 or argon-40, respectively).