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paleoproterozoic
The Paleoproterozoic (; also Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic occurring (2.5–1.6 Ga). This is when the continents first stabilized.
Paleontological evidence on the Earth's rotational history suggests that ~1.8 billion years ago, there were about 450 days in a year, implying 20 hour days.〔Giorgio Pannella (Paleontological evidence on the Earth's rotational history since early precambrian ) ''Astrophysics and Space Science'' 16.2 (1972): 212〕
== Paleoatmosphere ==
Before the significant increase in atmospheric oxygen almost all life that existed was anaerobic, that is, the metabolism of life depended on a form of cellular respiration that did not require oxygen.
Free oxygen in large amounts is toxic to most anaerobic bacteria. It is widely believed that the majority of existent anaerobic life on Earth died off. The only life that remained was either resistant to the oxidizing and poisonous effects of oxygen, or spent its life-cycle in an oxygen-free environment. This main event is called the oxygen catastrophe.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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