Prentice Hall. The students find it quite engaging. So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash. Uranium—thorium dating. Science The sedimentary rock layers exposed in the cliffs at Zumaia, Spain, are now tilted close to vertical. Create a data table in your lab notebook like this one to record your results.
Dating Rocks and Fossils Using Geologic Methods
This is what archaeologists use to determine the age of human-made artifacts. But this sediment doesn't typically include the necessary isotopes in measurable amounts. Geologists can then use Equation 1, referred to as the radioactive decay formulato determine the age of a sample. Chemical Geology. Certificate Program. Figure 2: The trapped charge accumulates over time at a rate determined by the amount of background radiation at the location where the sample was buried.