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

Early Whale with Webbed Feet

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

Sea Level Rise

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Offshore Peru, during the Eocene (~56-34 million years ago), showing two archaeocetes (ancient whales): Ocucajea picklingi and Supayacetus muizon.
Article

New Archaeocetes from Peru Are the Oldest Fossil Whales from South America

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An illustration of a recently discovered species of Monodontid, Bohaskaia monodontoides, and its beluga and narwhale relatives
Article

Smithsonian Scientists Describe a 'New' Fossil Whale

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Forams are tiny single-celled organisms.
Slideshow

Foraminifera

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