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Sources:
http://www.livescience.com/50227-biggest-asteroid-impact-zone-found-under-australia.html
http://www.sciencedirect.com/science/article/pii/S0040195114006477
http://www.livescience.com/45172-vredefort-crater-impact-melt-ejecta.html
http://news.nationalgeographic.com/news/2013/13/130214-biggest-asteroid-impacts-meteorites-space-2012da14/
http://science.nasa.gov/science-news/science-at-nasa/2008/30jun_tunguska/
http://www.livescience.com/48793-sudbury-basin-origins-revealed.html
http://www.nature.com/news/rock-samples-suggest-meteor-caused-tunguska-blast-1.13163