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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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An image of a Anomalocaris canadensis fossil.
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Anomalocaris canadensis

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A bright illustration of extinct predator Hurdia victoria.
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Hurdia Victoria

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a fossilized ancient sea creature
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Wiwaxia

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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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Smithsonian researchers with fossil whale skulls from the group Monodontidae
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Smithsonian Scientists Describe a New Fossil Whale

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dugong feeds on seagrass in the Red Sea
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Dugong Feeding

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A photo of an arid ocean cliff in Chile's Atacama Desert with the ocean below.
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Exploring Chile's Marine Fossil Record in the Atacama Desert

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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Paleobiologist Mark D. Uhen drills away rock to reveal the fossilized bones of Peruvian archaeocetes (ancient whales), in the Vertebrate Paleontology Department at the Museo de Historia Natural de San Marcos. Uhen is a professor at George Mason Univer
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Preparing a Fossil Whale Specimen

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