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Six American Nanodiamond-Rich Sites Found Saturday, January 03, 2009 - Anuradha Menon Home >> Headlines >> General Science   
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Abundant tiny particles of diamond dust exist in sediments dating to 12,900 years ago at six North American sites, adding strong evidence for Earth's impact with a rare swarm of carbon-and-water-rich comets or carbonaceous chondrites, reports a nine-member scientific team.These nanodiamonds, which are produced under high-temperature, high-pressure conditions created by cosmic impacts and have been found in meteorites, are concentrated in similarly aged sediments at Murray Springs, Arizona. (source: sciencedaily.com)
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