Geological research spanning more than a decade found Saskatchewan has one of the rarest kinds of impact craters on Earth.
or comet, generated so much energy that it liquified the Earth’s crust and created rock of a different kind.
Since the 1970s, it has been known that the water in Gow Lake fills an impact crater measuring roughly five kilometres across. It was assumed to be a central peak impact structure — a common form of crater, circular in shape, with terraced walls and a peak in the middle. “Being rare on Earth is one of the significant things about this crater,” Osinski said. “I would say it is the only actual example we have of this type of crater. The only other crater of its kind, in Australia, is quite eroded and there’s very little information left.”covered by debris fallen from the crater walls. It is a transitional form between a simple bowl-shaped crater and a complex crater with a central uplift.
“That projectile hits the surface of the Earth, penetrates somewhat and is essentially vaporized,” he said. “It’s all about kinetic energy. That thing is coming in staggeringly fast, 15 to 20 kilometres per second, with a huge amount of energy. That energy is left over as heat that can literally melt cubic kilometres of the Earth’s crust, instantly. The surrounding rock looks like volcanic rock.”
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