English definition of Archaean

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Definition of archaean

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Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..

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Huronian :: Huronian (a.) Of or pertaining to certain non-fossiliferous rocks on the borders of Lake Huron, which are supposed to correspond in time to the latter part of the Archaean age..

Eozoon :: Eozoon (n.) A peculiar structure found in the Archaean limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure..

Archaean :: Archaean (a.) Ancient; pertaining to the earliest period in geological history.

Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..