| 1. | It has a cosmopolitan distribution and is an important index fossil in biostratigraphy.
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| 2. | It is an important index fossil in biostratigraphy.
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| 3. | Important index fossils for the Cenomanian are the ammonites " Mantelliceras mantelli ".
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| 4. | Many ecphora species are important index fossils.
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| 5. | The family includes several important index fossils.
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| 6. | They have been recorded from every continent and many are used as zonal or index fossils.
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| 7. | It has become especially useful to metamorphic and igneous geologists where index fossils are seldom available.
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| 8. | Other index fossils from Coon Creek date a little older than 70.6 million years.
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| 9. | They lived during the Jurassic Period and serve as an index fossil for that time period.
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| 10. | "Phyllograptus " species are excellent index fossils or guide fossils for identifying Ordovician rocks.
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