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darn FR search will not give me more than one page on any search term, when I click ‘click to show older articles’ it comes up with no matches, sigh.

I found the modified wikipedia entry where this was discussed (added by me, edited later)

“There is no solid evidence of impacts leading to the four other major mass extinctions, though a recent report from Ohio State scientists stated that they have located a 483-km diameter impact crater beneath the East Antarctic Ice Sheet which may date back about 250 million years, based on gravity measurements, which might associate it with the Permian-Triassic extinction event.”