Absolute dating vs relative dating fossils

Relative-age time periods are what make up the Geologic Time Scale.

The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.

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A trace fossil is the remains of a rapidly evolving organism that was widespread geographically, and is known to have existed only during a specific geologic time period. This means that the oldest are the strata that are lying at the bottom.

On Earth, we have a very powerful method of relative age dating: fossil assemblages.

Paleontologists have examined layered sequences of fossil-bearing rocks all over the world, and noted where in those sequences certain fossils appear and disappear.

If you know when the top or bottom layers were formed - you know just about when was the middle one formed.The simplest is the law of superposition: if thing A is deposited on top of (or cuts across, or obliterates) thing B, then thing B must have been there already when thing A happened, so thing B is older than thing A.We have no idea how much older thing B is, we just know that it's older.What is the difference between relative dating and absolute dating?An absolute age is one determined usually by mass-spectrometry where an isotope is measured and then an age can be calculated a very very basic explanation.

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