> Would a comet contain enough [Iridium]? It depends on what the comet was made of. There aren’t a lot of pieces of comets to test, but the samples returned fro

> Would a comet contain enough [Iridium]? It depends on what the comet was made of. There aren’t a lot of pieces of comets to test, but the samples returned from Comet Wild-2, courtesy of NASA’s Stardust mission, found that they were very similar to carbonaceous chondrite meteorites, which are known to contain iridium (although somewhat less than ordinary chondrites). Presumably the iridium level of a cometary object wouldn’t be that far off, but it remains to be seen. So, the theory proposed doesn't account for existing observations? Keen to see what kind of comet would be needed, theoretically, to create the K-Pg Boundary. That said, I find the timing of the Deccan Traps and the (alleged) Shiva Crater to be reasonably compelling for the "something broke up and hit the Earth bad"