Waves cresting in the ocean.

Through Time

A Mesozoic Ocean scene

The Ocean Throughout Geologic Time

The ocean has gone through some dramatic transformations over time. This overview dives into our globe's ocean past.

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Featured Content

Photograph of the model of a Giant Megatooth Shark, taken from the front..

Shark Ancestors

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

A Collection of Cambrian Fossils

Blue whale skull being installed at National Museum of Natural History.

When Did Today’s Whales Get So Big?

A hippopotamus-like creature swims underwater

Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows

Although in reality an ichthyosaur and plesiosaur would have likely never battled, this widely shared lithograph by artist, geologist and paleontologist Henry De la Beche even inspired author Jules Verne to pen a similar scene in his book, Journey to the C

Unearthing History: Mary Anning's Hunt for Prehistoric Ocean Giants

Through Time Articles

Blue whale skull being installed at National Museum of Natural History.

When Did Today’s Whales Get So Big?

A hippopotamus-like creature swims underwater

Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows

ichthyosaurs frolic in the waves

Form Equals Function for Ancient Sea Lizards and Modern Whales

ancient fish

When Fish Wore Armor

a group of ichthyosaurs swims at the ocean's surface

Mystery of An Ichthyosaur Graveyard Revealed

A screenshot from video showing illustrations of ancient coral reefs.

Coral Reefs Changing Over Time

This new species of lobster (Dinochelus ausubeli) is blind and has bizarre claws. It was discovered about 300 meters (984 feet) deep in the Philippine Sea by a Census of Marine Life expedition.

Deep Ocean Diversity Slideshow

A team of scientists explore the Arctic ocean.

Under Arctic Ice

Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.

So You Think You're Smarter Than a Cephalopod?

An adult and juvenile killer whale frolic in the water.

Menopausal Moms: A Mammal Mystery

A bright-green sea slug with a black background.

Sea Slugs: One Species at a Time

A screenshot from the video showing a Palauan primitive cave eel.

Video of the Palauan primitive cave eel (Protanguilla palau)

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