Geologists think they have discovered the biggest impact event, recorded in rocks ~1.2billion years old in the Northwest Highlands of Scotland near Ullapool:
http://news.bbc.co.uk/1/hi/sci/tech/7314329.stm
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The much lauded anouncement of the discovery of an impact crater in the North Sea has been contested by other geologists who argue a different origin:
http://news.bbc.co.uk/1/hi/sci/tech/6503543.stm
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The 1908 Tunguska event is the largets extra-terrestrial “impact” event of modern times. Some geologists think they have found a crater which can be attrubuted to the event:
http://news.bbc.co.uk/1/hi/sci/tech/6239334.stm
More details about the event:
http://news.bbc.co.uk/1/hi/sci/tech/7470283.stm
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