The diagram below shows a stack of rock layers. These layers have not changed position since they formed. Examine the diagram, and answer the question that follows.

https://app39.studyisland.com/pics/67981LayerSequencewithFossils.gif

If the age of Layer 4 is 400 million years and the age of Layer 1 is 500 million years, then the age of Layer 3 is

Question

The diagram below shows a stack of rock layers. These layers have not changed position since they formed. Examine the diagram, and answer the question that follows.

https://app39.studyisland.com/pics/67981LayerSequencewithFossils.gif

If the age of Layer 4 is 400 million years and the age of Layer 1 is 500 million years, then the age of Layer 3 is

mrnood · Answer

OK - so what is the principle involved here?

You cannot give an actual age because the layers are not necessarily representing equal timespans

The point is that the layers are layed down in order

SO you can give a value for the max and minimum age of layer 3