Absolute vs relative age dating

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We define the rate of this radioactive decay in half-lives.If a radioactive isotope is said to have a half-life of 5,000 years that means after 5,000 years exactly half of it will have decayed from the parent isotope into the daughter isotopes.A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research.Here's the next step in that journey: the Geologic Time Scales of Earth and the Moon.

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It’s often much easier to date volcanic rocks than the fossils themselves or the sedimentary rocks they are found in.

So, often layers of volcanic rocks above and below the layers containing fossils can be dated to provide a date range for the fossil containing rocks.

The atoms in some chemical elements have different forms, called isotopes.

The same rock formation also contains a type of trilobite that was known to live 415 to 425 million years ago.

Since the rock formation contains both types of fossils the ago of the rock formation must be in the overlapping date range of 415 to 420 million years.Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

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