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What makes a fossil an index fossil ?

User Iwein
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Answer:

the fossil was formed only during a certain short time period

User Ohw
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Step-by-step explanation:

A fossil is an index fossil when it is distinctive, abundant, and limited in geological areas. A good index fossil lived for a short period of time so that the range of ages of the strata in which the index fossil is located is small. A good index fossil is found in a wide geological range.

A fossil is an index fossil when animals or plants preserved in the rock record of the Earth is characteristic by a particular span of geologic time or environment.

User SiddAjmera
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