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Asteroid impact finally confirmed?

A story on the newswires yesterday said that some deep-sea core studies
done in the Atlantic well off the east coast of Florida had finally
"proven" that an asteroid impact did occur at the end of the Cretaceous.

According to the story, the cores revealed the following pattern: 

First (deepest), a layer of normal fossiliferous sediments including
Cretaceous fossils

Second, a layer of green glassy bits, thought to be stuff crystallized
by the impact.

Third, a thin layer of brown clay thought to be debris from the asteroid
itself.  This layer shows the same iridium anomaly previously identified
in K-T sediments elsewhere.

Fourth, a two-inch-thick layer of deepsea clays virtually devoid of
fossils, representing an estimated 5,000 years .

Finally, sediments showing a more normal rate of fossilized animals.  

I've wondered more and more about the "asteroid impact" theory over the
past year or two.  I don't think it makes a whole lot of sense.  The
general outline hangs together, but one simple question still lacks an
answer. Very simply, if this asteroid-induced holocaust swept the world,
reached every continent and every corner of the ocean, wiped out
dinosaurs, mosasaurs, pterosaurs, ammonites, etc., _everywhere_, with
100% success -- then how did anything survive at all?

Can anyone offer a possible reasonable answer to this?

-- JSW