Accumulating Glitches. What best describes you? Guns, Germs, and Steel Study Guide. Now imagine that you come upon a formation like this:. The videos on Study. That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age.
Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.
5 principles of relative dating
Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault. As organisms exist at the same time period throughout the world, their presence or sometimes absence may be used to provide a relative age of the formations in which they are found. Inclusions are always older than the sedimentary rock within which they are found. The law of included fragments is a method of relative dating in geology.