Question

The image shows rock strata from different regions on Earth. Which fossil in the strata would best serve as an index fossil?
Fossil would best serve as an index fossil. 
F1 
F2
F3
F4

Answer 1

Answer:

F3

Explanation:

An index fossil is a fossil of an organism which lived at only one time during the evolutionary history. The index fossils are obtained from rock of one particular evolutionary time zone.  In the given image, F3 fossils are present in same strata or layer of the rock in all three regions. They are also not present in any other layer of any region. Hence. F3 would serve as best index fossil.

Answer 2

F3 is the appropriate option which will best serve as an index fossil and is denoted as option C.

What is an Index fossil?

These are fossils which are used to define and identify geologic periods and are obtained from rock of one particular evolutionary time zone.  

In the given image, F3 fossils are present in same strata of the rock in all three regions which is why it will best serve as an index fossil.

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