Grand canyon relative dating cross section

If you know the relative ages of two rock layers, you know which is older and which is younger, but you do not know how old the layers are in years.In some cases, it is very tricky to determine the sequence of events that leads to a certain formation.So the fault must be the youngest formation that is seen.The intrusion (D) cuts through the three sedimentary rock layers, so it must be younger than those layers.

These rocks were then uplifted to become mountains.He then sought to explain how fossil seashells could be found in rocks far from any ocean.As in the Tyrannosaurus rex Figure 11.10, fossils resemble living organisms.The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top.Based on this, layer C is oldest, followed by B and A.

Grand canyon relative dating cross section