Cenozoic Era

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Cenozoic see nuh ZOH ihk or sehn uh ZOH ihk, Era, is the most recent era in the geologic time scale of the earth's history. Geologists believe this era began about 65 million years ago. It is sometimes called the Age of Mammals. See also Mammal.

Ordovician Period

Ordovician Period, awr duh VIHSH uhn, was a time in Earth's history that lasted from around 505 million to 440 million years ago. The period takes… See more »

Devonian Period

Devonian, duh VOH nee uhn, Period was a time in Earth's history that lasted from around 410 million to 360 million years ago. The period takes its… See more »

Silurian Period

Silurian, suh LOOR ee uhn, Period was a time in Earth's history that lasted from around 440 million to 410 million years ago. Geologists first… See more »

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Cenozoic Era

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