What is an index fossil?
A)An organism that existed for a vast period of time and is representative of an era
B)An organisms that is restricted to one small, geographic setting
C)A trace fossil that defines a colony of organisms
D)An organism that was geographically widespread but limited to a short span of geologic time

Question

Quizplus · Accepted Answer

Index fossils are fossils of organisms that were geographically widespread but limited to a short span of geologic time. They are useful for determining the age of rock layers and correlating them with other rock layers in different locations.

What Is an Index Fossil