index fossil

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Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.

What Is Earth’s Velocity?

Thermonuclear hydrogen bomb, code-named MIKE, detonated in the Marshall Islands in the fall of 1952. Photo taken at a height of 12,000 feet, 50 miles from the detonation site. (Photo 6 of a series of 8) Atomic bomb explosion nuclear energy hydrogen energy

The Anthropocene Epoch: Adding Humans to the Chart of Geologic Time

Solar system illustration. (planets; sun)

Why Are Planets Round?

Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles

Why Is Pluto No Longer a Planet?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

Discover

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

Participants, some carry American flags, march in the civil rights march from Selma to Montgomery, Alabama, U.S. in 1965. The Selma-to-Montgomery, Alabama., civil rights march, 1965. Voter registration drive, Voting Rights Act

Riding Freedom: 10 Milestones in U.S. Civil Rights History

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg

Spies Like Us: 10 Famous Names in the Espionage Game

index fossil: Facts & Related Content

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Facts

Also Known As	guide fossil

Photos

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Topics

fossil record geochronology dating dinosaur Australopithecus Homo erectus Ardipithecus Neanderthal Homo habilis megalodon Australopithecus sediba feathered dinosaur

Key People

Loren Eiseley

American anthropologist

Quiz

Cross section of Earth showing the core, mantle, and crust

Everything Earth