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Color illustration of an ancient bivalve.

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Elevator Rudists

These "elevator" rudists, an ancient bivalve, used one long heavy valve to anchor...

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)

This illustration shows the edge of a warm inland sea during the Cretaceous Period,...