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There is a nice article today in the NYT Science Section(p C1) on
the possible extinction impact--based on physical evidence and
cratering physics, determining the flight direction of the object
impacting the ~Yucatan was from the Southeast with resulting large
damage to the north west, ie North America, thus explaining
comparatively high species extinction in NA vs globally.
Based on work of Schultz of Brown U et al.
If you like and no one else has, I'll get it and give a more
formal abstract (above basically off the top of my head...).
It may also be available online at www.nytimes.com