Properties of an Index Fossil

Index fossils are used to determine the relative ages of rocks.The best index fossils are of organisms that existed for a very brief time but are found over a large (widespread) area of Earth.  In a sequence of rock layers, an index fossil would not be found in very many layers vertically but would be found widespread horizontally from one place to another.

Properties of an Index Fossil

It is likely that a long time from now, humans will be an excellent index fossil.  Humans have existed for a relatively short time, yet our remains and signs of our existence can be found worldwide.

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https://www.youtube.com/watch?v=PN3xpDs_Wz0

​represents the rock layers and fossils found at four widely separated ares of exposed rock layers. Use it to answer the following questions.

The following diagram...