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Wiens has a Ph D in Physics, with a minor in Geology.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.Uniformitarian geologists consider this form of dating strong evidence that the Earth is billions of years old.

Using the decays of uranium and thorium, our galaxy has been found to be between 10 and 20 billion years old and the earth has been found to be 4.6 billion years old. Within experimental error, this estimate agrees with the 15 billion year estimate of the age of the Universe.

Very old rocks have been dated by measuring the amount of lead in the mineral zircon (Zr Si O4) which forms with radioactive uranium that takes more than 4 billion years to decay.

By this method, the age of the Earth has been estimated to be about 4.6 billion years.

In the special case in which parent and daughter atoms are present in equal quantities, the age of the specimen is the half-life of the parent isotope: The first assumption, that the amount of the daughter isotope in the original rock is known, is the weakest assumption.

decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..