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How about a nice soil-borne fungus like Coccidioides immitis?
I know dogs and humans can both contract Valley Fever from this lovely
little critter.

It's likely this event kicked up bunches of dust into the atmosphere and
if this dust was carrying some air-borne infectious agent, all you'd
have to do was breathe some air downwind to get sick.  And if you were
from an area where you never had encountered said fungus

So you could have wierd ash or dust falls killing PATCHES of plants,
wierd firestorms killing whatever it wanted too, wierd tidal effects
killing PATCHES of coastal terrestrial creatures and plants, wierd deep
oceanic effects killing off bunches of stuff in the water  (ooh maybe it
triggers something like a Red Tide), and wierd fungii killing PATCHES of
individuals unlucky enough to be down-wind.
Then we have some longer term weather conditions-probably a tad more
extreme than our recent El Nino to throw off plant recuperation and thus
the rest of the ecosystem.
Throw in my crazy idea that Late Cretaceous dinosaurs had lost most of
the ability to use their pineal glands to judge seasons in times of
seasonal disorders and thus really take a hit in recooperating a nice
breeding population.  And maybe for kicks throw in John's
mammals-eat-all the-eggs theory.

Sounds like fun.  Like shooting fish in a barrel


Tetanurae@aol.com wrote:
> The point you fail to see, is that if you keep making the nuclear winter
> effects bigger and the atmospheric baking longer and hotter, and the forest
> fires greater, you simply exterminate everything.  The greater the effects
> are, the more likely you will kill everything.
> No doubt a really really big rock from the sky would be devistating and kill
> everything, but it cannot be so selective as to kill say enantiornithines and
> not neornithines, or ammonites and not nautiloids.  Baking skies and burning
> forests do not selectively kill of basal ornithopods instead of basal
> primates, or avisaurids and hesperornithids instead of anseriformes: they kill
> everything.
> <<The effects listed need not have all ocurred to their greatest possible
> extent, but would be enough to upset the ecological balance of the entire
> planet, so that the extinctions would occur as an offshoot of the impact.>>
> But the extinctions would not have been selective, they would have devistated
> or destroyed everything, not whole groups of taxa, while leaving others
> completely untouched.