geologic time periods , geologic time scale , geological eras in order , geological time scale chart , geological time scale eras , phanerozoic , phanerozoic eon , precambrian era
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. The age of Earth when most meteorites struck the Earth has no trace of life or rocks. This is believed to have taken place about 4,600 million years ago. The period is called Azoic Era. Azoic means no life. The oldest rocks traced is 3,900 million years ago.
Owing to various controversies surrounding evolution, the term ˜azoic was replaced by terms like archaezoic, archaean, etc.