Six North American Sites Hold 12,900-year-old Nanodiamond-rich Soil
Thursday, January 1, 2009 - 18:35
in Astronomy & Space
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, scientists report. The discoveries are consistent with theory of Clovis-age disruption by a cosmic event, according to researchers.