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1 vote
Ichthyosaurs went extinct at the end of the:

Triassic Period
Permian Period
Jurassic Period
Cretaceous Period

User Danqing
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1 Answer

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Cretaceous Period. Fossils suggested that they were seen in the Mesozoic era and continue to thrive until they became extinct in the late Cretaceous with reasons still unknown.
User Pooja Singh
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