What is an index fossil?
A)a fossil found in a particular site
B)the ideal specimen of that species that all later descriptions must refer to
C)a marker used to determine the age of a geological layer
D)the type specimen of a species

Question

Quizplus · Accepted Answer

An index fossil is a type of fossil that is used to determine the age of the geological layer it is found in. This is because index fossils are typically associated with a particular span of time, and thus can be used to date the layer they are found in.

What Is an Index Fossil