However, human beings love to see factual precision, and we want to know how old something is.Please remember that all dating methods, even those termed "absolute," are subject to margins of error. That is a very small amount of possible error range. Modern studies almost always use two or more methods to confirm dating work and to build confidence in the results obtained.
Using relative dating principles and the position of layers within rock, it is possible to reconstruct the sequence of geologic events that have occurred at a site.
Topics include rock layer sequencing, fossil correlation, and radiometric dating.
This animation depicts many of the important principles of relative dating.
Find a Flash animation by Exploring Earth showing the formation of a fossil cast and mold.
Une puissante tempête a ravagé la couverture glacée de la mer arctique en Août 2012.