The revelators seem to not trust our current methods in geological dating. They recommend radium dating:
Quote:
57:7:3 Definite volcanic action dates from these times. The internal heat of the earth continued to be augmented by the deeper and deeper burial of the radioactive or heavier elements brought in from space by the meteors. The study of these radioactive elements will reveal that Urantia is more than one billion years old on its surface. The radium clock is your most reliable timepiece for making scientific estimates of the age of the planet, but all such estimates are too short because the radioactive materials open to your scrutiny are all derived from the earth's surface and hence represent Urantia's comparatively recent acquirements of these elements.
However, since the most stable Radium isotope has a half-life of only 1600 years, it seems ill-suited for geological time scales. The Radium-Lead technique is used for dating biological events:
http://www.astrofish.me/Sea_N_Space/Pb-Ra.htmlBut if we examine the disruption of Uranium, we see that it decays into Radium in an intermediate step. Both Uranium isotopes have large half-lives:
https://www.spec2000.net/06-atomicphysics.htm (scroll down to the Uranium-238 Decay Chain diagram)
So in theory, geological time could be dated using the relative proportions of the 2 Uranium isotopes plus Radium plus lead.