Exercise
Trilobites and Ammonites as Index Fossils
Explore how extinct organisms like trilobites and ammonites serve as important index fossils to date sedimentary rocks.
Questions
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MultiChoice
What kind of organism was an ancient trilobite?
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MultiChoice
During which geological era were trilobites most abundant and useful as index fossils?
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MultiChoice
Why are ammonites considered supreme index fossils for the Mesozoic Era?
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MultiChoice
Which physical feature on ammonite shells helps paleontologists distinguish between different species?
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MultiChoice
When did trilobites become completely extinct from Earth's oceans?
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MultiChoice
Which group of living modern animals is closely related to ancient ammonites?
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MultiChoice
A rock layer containing the specific trilobite species Paradoxides indicates which geological age?
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MultiChoice
Why are ammonite shells so frequently well-preserved in sedimentary rocks?
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MultiChoice
Where does the name 'trilobite' come from?
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MultiChoice
If a field geologist finds an ammonite fossil in a limestone layer, the rock was deposited during which era?
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MultiChoice
What aquatic environment did both trilobites and ammonites inhabit?
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MultiChoice
Why did the rapid evolutionary change of ammonites make them so helpful for dating rock layers?