What do you notice about the complexity of the fossils in the rocks? Where are the more simple fossils located? Where is the more complex fossil located?

The complexity of fossils increases as you look at the most recent rock layers. In this case, the simplest fossils are located in the deepest layers, while the most complex fossils are located in the deepest layers.

Explanation:

Rock layers are formed over time. This makes the fossils found in the shallowest layers to be younger and the less deep the layer is, the younger the fossil stored in it is, and the more similar this fossil is to today's living beings.  This shows that the shallower layers have more evolved and therefore more complex fossils.  In contrast, as we look at deeper layers, we can see fossils of increasingly simple and less complex forms of life.

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