![](https://webarchive.library.unt.edu/eot2008/20090116012318im_/http://www.nsf.gov/images/x.gif) News From the Field 6 North American Sites Hold 12,900-year-old Nanodiamond-rich Soil
![](https://webarchive.library.unt.edu/eot2008/20090116012318im_/http://www.nsf.gov/images/greenlineshort.jpg)
January 1, 2009
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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.
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Source University of Oregon
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