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Dating rocks is not a hard (no pun intended) science.
For example, many times one radiometric dating method will give a vast difference in age from another radiometric dating method used on dating the same rock!
At a widely publicized news conference in August of 1972, Dr.
Jeffrey Bada of Scripps Institute of Oceanography announced the "discovery" of a new dating method based on the rate of racemization of amino acids in fossil material.
Bordes, UA au CNRS 133, Université de Bordeaux I, Talence 33405, France) One way to assess a new dating method's reliability is by comparing its results with those from well established, independent techniques.
A controlled test of the electron spin resonance (ESR) dating method as it is currently being applied to teeth was attempted for the time range 100-250 ka, beyond that of C, at the archaeological site of La Chaise-de-Vouthon (Charente, France).
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AA(Department of Geology, Mc Master University, Hamilton, On, L8S 4M1, Canada), AB(Department of Geology, Mc Master University, Hamilton, On, L8S 4M1, Canada), AC(Department of Geology, Mc Master University, Hamilton, On, L8S 4M1, Canada), AD(Institut de Quaternaire, Centre F.
Although absent in modern enamel, a single ESR signal with g = 2.0018 in fossil tooth enamel hydroxyapatite increases in amplitude with increasing irradiation doses.
ESR ages are derived from the ratio of the AD, the radiation dose needed to produce the observed ESR signal, relative to the natural, environmental dose rate (ED) experienced by the tooth after deposition.
Don't all qualified scientists, including geologists, believe in Darwinian evolution and a billions of years old Earth and universe? Both evolutionists and creationists have certain built-in assumptions in interpreting and using scientific data when it comes to the earth's age.
The issue many times comes down to which assumptions are more reasonable.