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A fossil imprint of Haplophrentis carinatus with two oar-like appendages.
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Haplophrentis carinatus

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a fossilized jawbone and tooth of an ichthyosaur
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An Ichthyosaur Jaw Bone

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Color illustration of an ancient bivalve.
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Elevator Rudists

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ichthyosaurs frolic in the waves
Article

Form Equals Function for Ancient Sea Lizards and Modern Whales

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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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Eocene Whales and Penguins Off the Coast of Peru

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ancient fish
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When Fish Wore Armor

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An illustration of a recently discovered species of Monodontid, Bohaskaia monodontoides, and its beluga and narwhale relatives
Article

Smithsonian Scientists Describe a 'New' Fossil Whale

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serrations from sharks on a fossilized whalebone
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Bite Marks From the Past

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A shark tooth embedded in a bone
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A Tooth Left Behind

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

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Illustration of Opabinia with five eyes and what look like scales.
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Opabinia

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A fossil imprint of Ottoia prolifica.
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Ottoia prolifica

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