The is the idea or concept that ancient life forms succeeded each other in a definite, evolutionary pattern and that the contained assemblage of fossils can determine geologic ages of strata.

Principle of faunal succession

Explanation:

Principle of faunal succession -

According to this theory ,  the layer of the sedimentary rocks have fossils of the flora and fauna .

Which helps to study the rocks regarding the ages and the types of specifies found at that time .

It is the best method to study about the ancient lives , which helps by determining the relative age of the rocks .

Even the law of superposition is used to determine the time and age of the sedimentary rocks .