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  • 21 Aug, 2019

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File:Quartz-pebble Metaconglomerate (Jack Hills Quartzite, Archean, 2.65 To 3.05 Ga; Jack Hills, Western Australia) 2.jpg
7 September 2019

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30 April 2016

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current19:42, 7 September 2019Thumbnail for version as of 19:42, 7 September 20193,097 × 2,215 (3.44 MB)Gretarsson{{Information |description ={{en|1=Polished cut of specimen of Archaean (i.e. ~3 Billion years old) quartz-pebble metaconglomerate from the Jack Hills, Western Australia These metaconglomerates are renowed for containing the oldest mineral grains (so-called detrital zircons) of the earth (~4.4 Billion years old).<br><br>Original caption on flickr.com (slightly modified):<br>''Quartz-pebble metaconglomerate from the Precambrian of Australia. (Cranbrook Institute of Science collection, Bloomf...
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