Wiktionary英語版

出典:Wiktionary

Neoarchean

出典:『Wiktionary』 (2015/07/10 05:46 UTC 版)

形容詞

Neoarchean (not comparable)

  1. (geology) Of a geologic era within the Archaean eon from about 2800 to 2500 million years ago.

固有名詞

Neoarchean

  1. (geology) The era from 2,800 Ma to 2,500 Ma.

上位語

等位語

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ウィキペディア英語版

出典:Wikipedia

Neoarchean

出典:『Wikipedia』 (2010/11/14 14:43 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

The Neoarchean (pronounced niː.oʊ.ɑrˈkiː.ən/, also spelled Neoarchaean) is a geologic era within the Archaean. It spans the period of time from 2,800 to 2,500 million years ago—the period being defined chronometrically and not referenced to a specific level in a rock section on Earth. Oxygenic photosynthesis first evolved in this era and was accountable for the oxygen catastrophe which was to happen later in the paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, produced by these oxygen producing photoautotrophs, which evolved earlier in the Neoarchean. The supercontinent Kenorland formed during this period, about 2.7 billion years ago.

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