Precambrian Age

The Precambrian is the oldest era of Earth's history, and, of its origins (4 billion and 500 million years ago), the appearance of the first invertebrates with exoskeletons (542 million years ago). In this long period of time, the planet, newly formed, was affected by cosmic events and geological shocking that border on the limits of imagination.

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Words: 17,150
Language: English
ISBN: 9781301598076

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