Swedish meteorite may be remnant of asteroid collision

New Scientist : A limestone quarry in Sweden has produced around 100 iron-poor L chondrite meteorites that all date to 470 million years ago. But a newly discovered meteorite in the quarry that dates to the same period is not an L chondrite, nor is it like any other known meteorites. L chondrite meteorites from that period have been found all around Earth, and the bombardment is believed to have been caused by the collision of two asteroids. Because the new meteorite has been found in the same rock layer, it may be a remnant of the other asteroid, which is believed to have been much smaller than the one that produced the L chondrites. The meteorite bombardment could be connected to a burst of new species appearing in the fossil record in the same time period, though whether the impacts sparked the population explosion is uncertain.