[Regulator75]

Massive crater impact zone discovered near the tiny Hamlet of Bow City.

http://www.calgaryherald.com/news/al...427/story.html

"We know that the impact occurred within the last 70 million years," Doug Schmitt, co-author of the paper and a professor in the Faculty of Science at the U of A, said in a news release. "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."

Their research shows that the crater likely reached a depth of 1.6 to 2.4 kilometres — an impact that would have had major consequences.

"An impact of this magnitude would kill everything for quite a distance," said graduate student Wei Xie. "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."