Azoic Age, Azoic Era, Azoic Period and Azoic Eon were terms used before 1950 to describe the age of rocks formed before the appearance of life in the geologic sequence. The word Azoic is derived from the Greek a- meaning without and zo n meaning animal (or living being), it was first used to mean without death. Azoic was used as early as 1846 by a geologist named Adams, and gradually replaced the earlier term Primitive. Due to the controversy over evolution, Azoic was replaced, by 1900, in most usages by the term Archaean or Archaeozoic The Archaean was later subdivided into the Archaean and t

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