Find serious flaws in the superposition of the geologic column.
Find, for example, a group of human fossils in unquestioned Cambrian deposits. Find a fossilized dinosaur older than 65 million years with a human in its stomach.
On the other hand, knowing where in the world certain geological deposits are found allows you to make predictions of which fossils can be found there. Paleontologists are doing just that: they figure out what fossils they need to fill gaps, find deposits of the correct age, and after some searching they usually find the fossils. That is using the theory of evolution, as well as geology and other fields, to make predictions. Fulfilling those predictions further reinforces the strength of the theories.
***On the other hand, knowing where in the world certain geological deposits are found allows you to make predictions of which fossils can be found there. Paleontologists are doing just that: they figure out what fossils they need to fill gaps, find deposits of the correct age, and after some searching they usually find the fossils. That is using the theory of evolution, as well as geology and other fields, to make predictions. Fulfilling those predictions further reinforces the strength of the theories.***
Did you know that there is a model of the solar system with the Earth in the center which can predict the position of heavenly objects fairly accurately. Yet, the model is wrong. We know that today.