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Colorful illustration of extinct Archaeocyatha that lived on the seafloor.
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Archaeocyatha

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An image of a Anomalocaris canadensis fossil.
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Anomalocaris canadensis

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A handful of fossil pieces from the Cambrian period sit on a gray background.
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Scientists and Fossils

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a fossilized ancient sea creature
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Wiwaxia

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Globotruncana falsostuarti -- a foram that lived about 75 million years ago, during the Cretaceous Period.
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Globotruncana falsostuarti

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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A Collection of Cambrian Fossils

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Offshore Peru, during the Eocene (~56-34 million years ago), showing two archaeocetes (ancient whales): Ocucajea picklingi and Supayacetus muizon.
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New Archaeocetes from Peru Are the Oldest Fossil Whales from South America

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An illustration of a recently discovered species of Monodontid, Bohaskaia monodontoides, and its beluga and narwhale relatives
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Smithsonian Scientists Describe a 'New' Fossil Whale

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