The first billion years; when did life emerge?

There are three principal lines of evidence from which we can infer the timing of the origin of life on Earth: stromatolites, microfossils, and carbon isotope data. All indicate that life emerged earlier than ∼3500 million years ago, but the details and exact timing of life's beginnings remain...

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Veröffentlicht in:	Elements (Quebec) 2006-08, Vol.2 (4), p.229-233
1. Verfasser:	Schopf, J. William
Format:	Artikel
Sprache:	eng
Schlagworte:	Africa Archean Australasia Australia biogenic structures biomarkers C-13/C-12 carbon Earth isotope ratios isotopes life origin Precambrian sedimentary structures South Africa Southern Africa stable isotopes Stratigraphy stromatolites Western Australia
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Beschreibung
Zusammenfassung:	There are three principal lines of evidence from which we can infer the timing of the origin of life on Earth: stromatolites, microfossils, and carbon isotope data. All indicate that life emerged earlier than ∼3500 million years ago, but the details and exact timing of life's beginnings remain unknown.
ISSN:	1811-5209 1811-5217
DOI:	10.2113/gselements.2.4.229