The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.
You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. Choose your answers to the questions and click 'Next' to see the next question.Relative dating is different from absolute dating in which specific dates are assigned to geologic events (we will discuss absolute dating techniques later).(light brown) Next, fossil-rich sedimentary rocks were precipitated.The USGS has a good introduction of Relative Dating to have you practice putting historical events in the correct order.Rock layers represent "historical events," so a rock layer is like a page in the book of Earth's geologic history. There are five different pictures of one rock sequence throughout time.