Nanodiamonds:How they could prove that comets made dozens of mammal species of species extinct

Eight scientists from several different universities published a finding on Friday about diamonds and how they could show that comets led to the extinction of dozens of different species of mammals on the Earth about thirteen thousand years ago. The scientists looked at layers of sediment that dated about twelve thousand nine hundred years ago at six North American locations. Each time they founded a rich amount of nanodiamonds that are produced under high-temperature and high-pressure conditions that can be created by comets colliding with the Earth. I think that this is a very important discovery and that it could explain many things. I also believe the subject should be studied more to see if there are any other possible causes for the extinction of dozens of mammals species on Earth.

Source:http://www.cnn.com/2009/TECH/science/01/02/comet.diamonds/index.html