Seems WAY to early to tie it to the end-Permian extinction. It's one thing to say that the rocks underneath are, we think, of the right general geologic age, quite another to tie the impact to a well-defined extinction. If I recall, the latest eveidence is that the end-Permian was a very rapid dieoff. If the crater is even 10my older or younger than that divide, then it'd be pretty tough to argue that it's the clear cause.

What's sealed it for the KT impactor is you have such unambigous evidence from so many locales. In parts of the US, you get cretaceous sediments with dinosaur fossils, then some soot and tektites and tsunami debris and what have you, then more sediments much like the cretaceous ones but without the dinos.

You'd need a really precise date on that crater before youcould get too excited. For that matter, if you had an impact that big when gondwana was still intact, shouldn't someone have found impact debris in Australia or South America? You'd think it's splash out material to a huge distance.

Of course, if it does turn out to be an impact and is NOT linked to a known extinction, that'd be interesting too.