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Ancient Impact Crater Discovered in Canada

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Ancient Impact Crater Discovered in Canada

“We know that the impact occurred within the last 70 million years, and in that time about 1.5 km of sediment has been eroded. That makes it really hard to pin down and actually date the impact,” said Dr Douglas Schmitt of the University of Alberta, a co-author of the paper published in the journal Meteoritics & Planetary Science.

“Time and glaciers have buried and eroded much of the evidence, making it impossible at this point to say with full certainty the ring-like structure was caused by a meteorite impact, but that’s what seismic and geological evidence strongly suggests.”

Erosion has worn away all but the roots of the crater, leaving a semicircular depression with a central peak. When the crater formed, it likely reached a depth of 1.6 to 2.4 km.

Outcrop photographs from the Bow City crater: top - panoramic view; bottom - a close-up showing thrust faults, outlined in red; geologist kneeling on outcrop, black arrow, for scale. Image credit: Paul Glombick et al.

“An impact of this magnitude would kill everything for quite a distance,” said Wei Xie, a graduate student at the University of Alberta and a co-author on the study.

“If it happened today, Calgary (200 km to the northwest) would be completely fried and in Edmonton (500 km northwest), every window would have been blown out.”

“Something of that size, throwing that much debris in the air, potentially would have global consequences; there could have been ramifications for decades.”

Source


Follow: Geology
Published by , 05.10.2014 at 06:02
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Goran
Goran 5 October 14 23:36 The traps were slow killers, and nothing compared to the instantaneous energy imput delivered by a large impact. Text hided expand
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Vladislav
Vladislav 7 October 14 21:41 Remember, heat radiates at the speed of light, so you won't have time to duck if you go too big. It doesn't take as big a rock as you might think to fry you at quite a distance. Text hided expand
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Owee
Owee 8 October 14 15:50 When are they going to discover the huge meteor crater that is filled with water and forms Hudson's Bay? Text hided expand
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