Fossil beaches, like this one in Gabon, Africa, are found all over the world. Fossil beaches are the remains of ancient seabeds that have been preserved due to a change in sea level or a shift in elevation. Some scientists say that the fossils in Gabon may be the oldest multicellular organisms ever found—more than 2 billion years old!

Photograph by Michael Nichols

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sea level
sea level Encyclopedic Entry

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Encyclopedic entry. Sea level is the base level for measuring elevation and depth on Earth.

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A beach is a narrow, gently sloping strip of land that lies along the edge of an ocean or a lake

tide
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Encyclopedic entry. The regular rise and fall of the ocean’s waters are known as tides. Along coasts, the water slowly rises up over the shore and then slowly falls back again.