Form the basis of paleomagnetic dating
Fortunately, there are other methods available to researchers.All trees of the same species in an area usually have roughly the same pattern of growth.It is based on the fact that amino acids (the building blocks of all proteins) exist in two mirror image forms, both of which otherwise have the same chemical structures.
Aspartic acid (one of the 20 amino acids) is usually extracted from samples for this dating technique. The earliest evidence of writing anywhere in the world only goes back about 5000 years.Paleoanthropologists frequently need chronometric dating systems that can date things that are many thousands or even millions of years older.Austin simply assumes that the first explanation is correct and then he proceeds to use the 'presence' of 'excess argon' in his samples to question the reliability of all K-Ar dates on other rocks and minerals. The validity of either hypothesis #2 or #3 would provide additional evidence that Austin's application of the K-Ar method is flawed and that he has failed to prove that the K-Ar method is universally invalid.