Scientists Discover the First Known Meteorite Fragments from The Tunguska Event...
The Tunguska Event was a huge explosion that occur... ...ts, thumblike impressions found on the surface of meteorites which are caused by ablation as the hot rock fall...
http://www.neatorama.com/2013/05/06/Scientists-Discover-the-First-Known-Meteorite-Fragments-from-The-Tunguska-Event/



