Not quite Andrew. They have found shocked quartz, zircon, tektites etc
at other event boundary deposition layers. Not quite as much Iridium,
but this is not the
only mineral/element for evidence of impact. I have just not read/heard much
on further debate.

Interesting topic, eh.

Emilio

Andrew Grebneff wrote:

>> Havent read much about extinction events after the Chixulub crater
>> was found
>> and several books written re: Dinos, Chixulub and the KT. I assume the
>> debating is alive and well.
>>
>> Has anyone proposed, with some evidence, other crater/event
>> relationships
>> to the rest of the "Big Five"?
>
>
> Some have proposed that all such mass-extinctions were
> impact-related. However the only one for which there is evidence of
> such a cause is the K-T. The others were all of other causes.
> --
> Andrew Grebneff
> 165 Evans St, Dunedin, New Zealand
> 64 (3) 473-8863
> <[log in to unmask]>
> Fossil preparator
> Seashell, Macintosh & VW/Toyota van nut
> I want your sinistral gastropods!
>