World-Wide KT Boundary

["Beyer, Eric" <Eric.Beyer@cognos.com>]

Much has been said, studied and written about the KT boundary and the events
that caused such a world-wide extinction.  I have a few questions that may
be juvenile but none the less will get asked...

How much is known about the KT boundary layer outside of the western
hemisphere?  
Are the findings in other parts of the world consistent with western
findings?
The KT layer has been seen to be 3 feet wide in some areas and 3 mm in
others, how much time does that layer represent?

I guess the thrust of query is knowing how many of the world-wide
catastrophe theories that are accepted today are based on world-wide data?


Direction to accessible reading material on this would be appreciated.


Cheers;
Eric