Archæan

comparative more Archæan · superlative most Archæan

1. archaicArchaic form of Archaean.

1. archaicArchaic form of Archaean.

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   The whole history of the earth is divided into five eras, with corresponding rock-systems. These are: 1. Archæan or Eozoic¹ era, embodied in the Laurentian system; 2. Palæozoic² era, embodied in the Palæozoic or Primary system; 3. Mesozoic³ era, recorded in the Secondary system; 4. Cenozoic,⁴ recorded in the Tertiary and Quaternary systems; and, 5. The Psychozoic era, or era of Mind, recorded in the recent system.

   1883, Joseph Le Conte, Elements of Geology: A Text-book for Colleges and for the General Reader, New York: D. Appleton and Company