The Cambrian period was an important time in the history of life on Earth. Many strange new creatures evolved and came to dominate the seas during this period.
Geologic time started 4.6 billion years ago with the formation of the Earth. As time progressed the surface of the molten planet cooled, oceans formed, and life arose. These events left a mark on the land which can be glimpsed through the rock and fossil records.
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