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What could a geologist say about that section of rock?

Following the Principle of Original Horizontality, he could say that whatever forces caused the deformation, like an earthquake, must have occurred after the formation of all the rock strata.

Geologists use this type of method all the time to establish relative ages of rocks.

Now, what if instead of being horizontal, this rock layer was found in a tilted position?

These items are called inclusions - foreign bodies of rock or mineral enclosed within another rock.

Because the sedimentary rock had to have formed around the object for it to be encased within the layers, geologists can establish relative dates between the inclusions and the surrounding rock.

We'll even visit the Grand Canyon to solve the mystery of the Great Unconformity!

Imagine that you're a geologist, studying the amazing rock formations of the Grand Canyon.

There may be a layer missing in the strata, or a set of sedimentary rock on top of metamorphic rock.