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The tilted rocks at the bottom are part of the Proterozoic Grand Canyon Group (aged 825 to 1,250 Ma).The flat-lying rocks at the top are Paleozoic (540 to 250 Ma).
Layers of soil that are younger are found on top of layers of soil that are older.
New layers are formed later more recently than the older ones, so they sit on top.
Stratigraphy, or layers of soil, at an archaeological site in the Islands of Orkney, Scotland.
The Proterozoic rocks of the Grand Canyon Group have been tilted and then eroded to a flat surface prior to deposition of the younger Paleozoic rocks.
The difference in time between the youngest of the Proterozoic rocks and the oldest of the Paleozoic rocks is close to 300 million years.