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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

Evidence shows that life probably began in the ocean at least 3.5 billion years...

Tue, 09/20/2011 - 15:30

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

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Cambrian Period (542 – 488 Million Years Ago)

The basic body plans of all modern animals were set during the Cambrian Period, 542...

A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.

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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

Earth’s first animals had soft bodies. This illustration shows a community of...