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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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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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A bright illustration of extinct predator Hurdia victoria.
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Hurdia Victoria

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A relative of insects, trilobites lived on the ocean floor during the Cambrian period.
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Trilobites

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Two researchers, looking for fossil whales, scan a rock formation in Peru's Pisco Basin.
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Searching for Fossil Whales in Peru

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A researcher holds an arm bone from a "toothed" mysticete whale from Vancouver Island.
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Arm Bone Fossil of an Ancient Toothed Whale

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Smithsonian researchers eat a meal in preparation for a fossil excavation
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A Squalodontid Success

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A Smithsonian scientist with a whale fossil he excavated
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Panama Expedition Success

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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 close up of a sediment core.
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Sediment Core Close-Up

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