Start Forms of relative dating

Forms of relative dating

This just goes to show that just because independent estimates of age seem to agree with each other doesn't mean that they're correct - despite the fact that this particular argument is the very same one used to support the validity of radiometric dating today.

What is especially telling about this whole story is the conclusion of the absolute truth of the conclusion based on premises that are weak, or at least not adequately demonstrated.

Chamberlain (1899) pointed out that Kelvin's calculations were only as good as the assumptions on which they were based.

However, on the whole, he thought that these sources were not adequate to account for anything more than a small faction of the heat lost by the Earth.

Based on these assumptions he at first suggested an age of the Earth of between 100 Ma and 500 Ma.

The isochron dating method theoretically overcomes the need to know the initial ratio of parent and daughter isotopes. For now, we will look at those methods that do fall under the above assumptions.

Interweaving the relative time scale with the atomic time scale poses certain problems because only certain types of rocks, chiefly the igneous variety, can be dated directly by radiometric methods; but these rocks do not ordinarily contain fossils.

Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.