Geological time scale mass extinctions cambrian explosion
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Precambrian (or Pre-Cambrian) is an informal term in geology and paleontology for the time from the formation of the Earth, about 4500 million years ago (mya), to the Cambrian explosion of life that occurred 542 mya, which marked the beginning of the Paleozoic Era and the Cambrian Period.
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The geologic time scale (GTS) is a system of chronological dating that classifies geological strata (stratigraphy) in time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events in geologic history.
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