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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
Slideshow

The Ocean Throughout Geologic Time, An Image Gallery

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Color illustration of an ancient bivalve.
Slideshow

Rudist Reefs

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Illustration of the extinct ammonite, related to the modern squid.
Photo

Ammonite

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Rudist clams are mollusks that went extinct about 65 million years ago.
Photo

Rudist Clams

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An illustration of the megalodon shark.
Photo

Ancient Giant Megatooth Shark

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Color illustration of an ancient bivalve.
Photo

Elevator Rudists

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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.
Photo

Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
Photo

The Archean Eon (4,600 – 2,500 Million Years Ago)

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Notice the pink tentacles, which “recliners” used to filter feed.
Photo

Recliner Rudists

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
Photo

Cretaceous-Paleogene Boundary (65 Million Years Ago)

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

Cambrian Period (542 – 488 Million Years Ago)

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Illustration of a four-legged proto-whale with webbed feet.
Photo

Early Whale with Webbed Feet

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