Sometimes when an organism dies, it’s body, or a part of it ends up in an environment which does not let it decompose. Thus, the impressions of body structures of these organisms are preserved. These preserved traces of organisms are called fossils.

Fossil dating helps in determining the order of appearance of organisms in the evolutionary process. There are two ways of fossil dating. They are:

1. Digging of fossils from Earth

2. By detecting the ratio of different isotopes of same element in fossil material.