Index Fossil

Front

What is an index fossil?

Back

An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale. It is typically widespread, abundant, and existed for a short duration.

Front

What are the characteristics of a good index fossil?

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A good index fossil should be widespread, abundant, and have a short geological lifespan.

Front

Why is the Ammonite considered a good index fossil?

Back

Ammonites are considered good index fossils because they were widespread and existed for a relatively short period, making them useful for dating rock layers.

Front

What does it mean if two fossils are found in different locations but are the same type?

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If two fossils are found in different locations but are the same type, it suggests that the rock layers containing those fossils are likely the same age.

Front

What is the difference between absolute age and relative age?

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Absolute age refers to the actual age of a rock or fossil in years, while relative age determines the age of a rock or fossil in relation to other rocks or fossils.

Front

What is an example of an index fossil?

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An example of an index fossil is the trilobite, which is used to identify certain geological periods.

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Why is fossil #4 not a good index fossil?

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Fossil #4 is not a good index fossil because it is not short-lived and does not appear in numerous layers.

Front

How can index fossils help in dating rock layers?

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Index fossils help in dating rock layers by providing a reference point for the age of the layers in which they are found.

Front

What is the significance of finding the same index fossil in different rock layers?

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Finding the same index fossil in different rock layers indicates that those layers were formed during the same geological time period.

Front

What role do index fossils play in understanding Earth's history?

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Index fossils play a crucial role in understanding Earth's history by helping geologists correlate the ages of rock layers across different locations.