The study of geology grew out of field studies associated with mining and engineering during the sixteenth to nineteenth centuries.
In these early studies the order of sedimentary rocks and structures were used to date geologic time periods and events in a relative way.
By combining Von Weizsackerâ€™s argon abundance arguments with Kohlhorsterâ€™s observation that potassium emitted gamma-radiation, Bramley (1937) presented strong evidence that potassium underwent dual decay.
Chamberlain (1899) pointed out that Kelvin’s calculations were only as good as the assumptions on which they were based.At first, the use of “key” diagnostic fossils was used to compare different areas of the geologic column.Although there were attempts to make relative age estimates, no direct dating method was available until the twentieth century.The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.These two independent and agreeing dating methods for of the age of two primary members of the solar system formed a strong case for the correctness of his answer within the scientific community.was published, the earth was “scientifically” determined to be 100 million years old. In 1947, science firmly established that the earth was 3.4 billion years old.