Azoic Eon

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Azoic Age — Azoic Age, 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… … Wikipedia
azoic — [ə zō′ik, āzō′ik] adj. [Gr azōos (< a , without + zōē, life: see BIO ) + IC] 1. without any life [an azoic ecological zone] 2. [usually A ] designating or of the earliest part of the Archean Eon, when there was no life on earth … English World dictionary
Timetable of the Precambrian — This is a timeline of geological and relevant astronomical events on Earth before the Cambrian period started. This covers 88% of the duration of the Earth. The dates given are based on the best current scientific evidence and where possible are… … Wikipedia
Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… … Wikipedia
Escala temporal geológica — Saltar a navegación, búsqueda La escala temporal geológica es utilizada por geólogos y otros científicos para describir la cronología y las relaciones entre los eventos que han ocurrido durante la historia de la Tierra. La tabla de períodos… … Wikipedia Español

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