Radiometric dating exercises
However, this causes a problem for those who believe based on the Bible that life has only existed on the earth for a few thousand years, since fossils are found in rocks that are dated to be over 500 million years old by radiometric methods, and some fossils are found in rocks that are dated to be billions of years old.
But there are some questions that come to mind: Calculus students typically meet this problem somewhere in the second semester.
The site also provides fact sheets on the age of the Earth and isochron dating.
Wiens has a Ph D in Physics, with a minor in Geology.
If there were such a pair of isotopes, radiometric dating would be very simple.
We could be sure that a mineral containing parentium originally had no daughterium.