Determining the Age of a Fossil

Fossil is the mark or remains of an organism that lived thousands or millions of years ago. Some fossils are leaves, shells, or skeletons that were preserved after a plant or animal died. Others are tracks or trails left by moving animals. Most fossils are found in sedimentary rocks. These fossils formed from plant or animal remains that were quickly buried in sediments -- the mud or sand that collects at the bottom of rivers, …

…how to determine the age of a fossil, I always thought that it was just a number which paleontologist came up with just by looking at the object (fossil). I have also mentioned how different things about what are fossils use for and incorporate it with lecture notes and scientific articles. I could now say how hard it is to determine how old is a fossil. I guess we could leave that to the scientists.