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The Precambrian Time lasted from 4 billion years ago to 600 million years ago
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The Paleozoic era started 600 million years ago to 225 million years ago.
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The Mesozoic Era started 225 million years ago and ended 70 million years ago
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The Cenozoic era is the most recent era, it started 70 million years ago and is up untill now.
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