Sexchatten op skype - Modern fossil dating methods

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Many people think that radiometric dating has proved the Earth is millions of years old.

That’s understandable, given the image that surrounds the method. 200.4 ± 3.2 million years) gives the impression that the method is precise and reliable (box below).

For example, we can measure its mass, its volume, its colour, the minerals in it, their size and the way they are arranged.

We can crush the rock and measure its chemical composition and the radioactive elements it contains.

By looking at other outcrops in the area, our geologist is able to draw a geological map which records how the rocks are related to each other in the field.

But we do not have an instrument that directly measures age.

And then, depending on the assumptions we make, we can obtain any date we like.

Here he can see that some curved sedimentary rocks have been cut vertically by a sheet of volcanic rock called a dyke.

It is clear that the sedimentary rock was deposited and folded before the dyke was squeezed into place.

It may be surprising to learn that evolutionary geologists themselves will not accept a radiometric date unless they think it is correct—i.e. So, how do geologists know how to interpret their radiometric dates and what the ‘correct’ date should be?

it matches what they already believe on other grounds. A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.


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