According to a study conducted by eight archaelogists and geologists from the universities of Oregon and California, tiny diamonds found in soil lead people to believe that a comet exploded on or above North America about 13,000 years ago. This comet apparantly led to the distinction of many mammals. A couple of these mammals were humans and mammoths. Not only did this comet have an affect on the population but it also changed weather patterns. The heat from the comet more than likely melted a glacier from the Great Lakes region causing a flood down the Mississippi River. The cold waves from the glacier were then sent to the Gulf of Mexico and Atlantic Ocean currents changing the climate. This sent the world into a cooling period called the Younger Dryas. Scientists have only found these nanodiamonds in six locations which are all within the Younger Dryas Boundary.I think it's so crazy that scientists can tell so much from some tiny diamonds found in some dirt from 12,900 years ago. It's also insane how one comet can affect the whole world.
I got this info from: http://www.cnn.com/2009/TECH/science/01/02/comet.diamonds/index.html
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