What is a great period in the history of the Earth. Note: The geologic ages are as follows: 1. The Archæan, including the time when was no life and the time of the earliest and simplest forms of life called?

age — A great period in the history of the Earth. Note: The geologic ages are as follows: 1. The Archæan, including the time when was no life and the time of the earliest and simplest forms of life. (Webster's 1913.)

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