You can't make the cookie, then the chocolate chips, and then insert them into the cookie.

Principle of fossil succession: This principle is very similar to that of superposition.

teaching relative age dating-1

The reason Fault F is younger than layers A, B, and C is because it cuts the layers.

However, it does not cut layers D and E, so those layers are younger than Fault F.

The only exception is instead of rock layers we're focusing on fossils.

These fossils are found in rocks in chronological order in rock strata with the oldest being on the bottom and the youngest at the top.

So, instead of saying when something happened, it puts events in the order they happened.

So, basically it's the difference between saying 'I'm 25 years old, and my sibling is 20 years old' and 'I'm older than my sibling.' Geologists use a variety of techniques, or principles, to determine the relative age of a rock unit.

This same process applies with each layer to the cake added.

You can't start with the top layer and add the ones under it since there would be nothing to build on.

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If we return to our example of the layered cake, the cake has to be there first before you can cut with a knife.