In horizontal sedimentary rock layers, the oldest layer is at the bottom. Faults move over time causing the rock layers to move.
Here’s a Fault Faults This crack in the rock layers is called a fault.
Each of them typically exists in igneous rock, or rock made from cooled magma.
However, "relative" dating or time can be an easy concept for students to learn.But this sediment doesn't typically include the necessary isotopes in measurable amounts.Fossils can't form in the igneous rock that usually does contain the isotopes.For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.(older than this rock, younger than that rock.) Age cont.