Index Fossil Worksheet
Explore the characteristics and importance of index fossils in dating geological strata and understanding Earth's history.
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Index Fossil Worksheet
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Read each question carefully and provide concise answers based on your understanding of index fossils.
1. Which characteristic is MOST crucial for a fossil to be considered an index fossil?
Large size and well-preserved.
Wide geographic distribution and short stratigraphic range.
Found only in marine environments.
Belongs to an extinct species.
2. Why are index fossils essential for relative dating of rock layers?
They are always found in the youngest rock layers.
Their presence indicates a specific geological time period.
They provide evidence of absolute age.
They are typically radioactive.
3. Index fossils must have a geographic distribution and a stratigraphic range.
4. The principle of faunal succession states that fossil organisms succeed one another in a definite and order.
5. Briefly explain how index fossils help scientists correlate rock layers from different locations.
6. Give an example of a common index fossil and the geological period it represents.
7. All fossils can be used as index fossils.
True
False
8. Index fossils are primarily used for absolute dating.
True
False
9. Observe the image below of a fossil. If this fossil was found in multiple rock layers across different continents, what characteristics would make it a good index fossil?
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