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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.
Photo

Elevator Rudists

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This family tree shows how the ancestors of whales moved gradually from land to sea.
Photo

The Whale Family Tree

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Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea.
Photo

Whales Returned to the Sea

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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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Fossil mosasaur skull and partial skeleton sitting in what looks like the dirt it was excavated from.
Article

If You Build An Ocean, Sea Monsters Will Come

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Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.
Slideshow

Bioluminescent Animals Photo Gallery

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The Belize Barrier Reef Reserve System consists of the largest barrier reef in the northern hemisphere, offshore atolls, and several hundred sand cays, mangrove forests, coastal lagoons, and estuaries. The system's seven sites illustrate the evolutionary h
Article

Charles Darwin's Ocean Upwelling

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The Komodo National Park site in Indonesia was inscribed on the World Heritage List in 1991. The site hosts "Komodo dragons" (Varanus komodoensis), a unique species that exists nowhere else in the world and is of great interest to scientists studying evolu
Article

Tunicates—Not So Spineless Invertebrates

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

A Collection of Cambrian Fossils

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the skull of a mosasaur
Article

Meals of the Mighty Mosasaur

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