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A screenshot from video showing illustrations of ancient coral reefs.
Video

Coral Reefs Changing Over Time

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
Article

Long Before Coral, Mollusks Built the Ocean's Reefs

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Color illustration of an ancient bivalve.
Slideshow

Rudist Reefs

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Two nurse sharks hover over a baited cage
Lesson Plan

The Methane Circus

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
Photo

Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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a deep-sea submersible
Video

Submersible Collects Deep-Sea Corals

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Forams are tiny single-celled organisms.
Slideshow

Foraminifera

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

Recliner Rudists

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

Rudist Clams

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On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
Overview

Sea Level Rise

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