Now a scientist claims to have discovered its exact location.
Palaeontologist Dr Mike Simms believes he has found the 25 mile-wide impact crater under the small town of Lairg in northern Scotland.For years scientists have been studying green rock fragments found sandwiched between 1.2 billion-year-old sandstone near Ullapool, 30 miles to the west of Lairg.
For decades this layer was thought to be a volcanic mudflow until, in 2008, geologists from Oxford and Aberdeen proved that it had actually been formed by a giant meteorite impact.read more
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