Aug 21 1992
From The Space Library
The journal Science carried reports by two teams of scientists who had found new evidence that speeding objects from space struck the Earth 370 million and 65 million years ago, possibly disrupting the global climate and causing mass extinctions. The scientists found tiny glass beads called microtektites in Belgian shale. The beads, more than 400 of which were found in a rock layer two to four inches thick, were reported to have round, elongated, teardrop and dumbbell shapes. The scientists said geochemical analysis strongly suggested that they were produced from a cosmic collision. (C Trib, Aug 23/92)
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