Contents of 7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

Cross section showing how to match up rocks found in different places by looking closely at the layers and the organisms found in the rocks of various layers.

Fig 7.8

Correlation is the process of matching up rocks found in different places.

How William Smith correlated rock exposures using fossils.