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The Warrawoona Group is a geological unit in Western Australia containing putative fossils of cyanobacteria cells. Dated 3.465 Ga,〔(Lunar and Planetary Science XXXV (2004): "Characterization Of The Organic Matter In An Archean Chert (Warrawoona, Australia)." )〕 these microstructures, found in archean chert, are considered to be the oldest known geological record of life on earth.〔http://www.cosis.net/abstracts/EGU04/03612/EGU04-J-03612.pdf Geophysical Research Abstracts, Vol. 6, 03612, 2004: SRef-ID: 1607-7962/gra/EGU04-A-03612: European Geosciences Union 2004: "Characterization Of The Organic Matter In An Archean Chert (Warrawoona, Australia)"〕 The fossils in this group were discovered by Arthur Hugh Hickman in 1983 in Warrawoona, , a region on the Pilbara craton in the northern part of Pilbara province. Whether or not the fossils are authentic was disputed in the past, as abiotic processes could not be ruled out.〔''Questioning the evidence for Earth's oldest fossils'', Nature 416, 76-81 (7 March 2002) | 〕〔(H.J. HOFMANN, ASTROBIOLOGY Volume 4, Number 2, 2004, ''Archean Microfossils and Abiomorphs'', McGill University )〕 Currently the fossils are thought to be of biological origin.〔Dean, Tim. ("World’s oldest fossils reveal earliest life on Earth" ), ''Australian Life Scientist'', 23 August 2011. Retrieved on 2011-08-23.〕〔''Microfossils of sulphur-metabolizing cells in 3.4-billion-year-old rocks of Western Australia'', Nature Geoscience (2011), 〕 ==See also== * North Pole, WA for similar issues *Origin of life *Timetable of the Precambrian *Geology of Australia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Warrawoona Group」の詳細全文を読む スポンサード リンク
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