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Color illustration of an ancient bivalve.
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Elevator Rudists

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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Illustration of the extinct ammonite, related to the modern squid.
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Ammonite

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
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Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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