
Ammonite
Prehistoric Existence
Ammonites lived millions of years ago, so the term highlights ancient history and geology.

The rock layer containing the ammonite must be Jurassic in age.
Extinction Event
Ammonites became extinct, which often links to discussions on natural history and mass extinctions.

Like the dinosaurs, the ammonite vanished during a mass extinction.
Fossil Identification
Ammonites are commonly found as fossils, so 'ammonite' refers to both the creature and its fossil.

That spiral pattern is the hallmark of an ammonite's fossil.
Compare with
CephalopodExtinctFossilMarineNautilusPrehistoricShellSpiral
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