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>... apparently, at least in North America, the forests
>were temporarily removed, since immediately above the Iridium
>layer almost all "pollen" is fern spores (for about a centimeter).
>swf@elsegundoca.ncr.com                sarima@netcom.com

Interesting, since one prediction of the impact theory is regional (global?)
forest fires. If they were severe enough, the surviving trees might take maybe
a million years to re-seed themselves populously across the devastated areas.

>The basic pattern of the extinction was the same as most others:
>large and/or specialized land animals got chopped.  Small, mostly
>generalized land animals made it through.  In the sea the pattern
>was similar. except that most planktonic forms (microscopic) also
>died out as well.

This is also predictable from the impact hypothesis. Global dust would shut out
the sunlight that planktonic forms need. This would disrupt the food chain all
the way to the large sea reptiles (plesiosaurs, et al). The survivors on land
and at sea would be the scroungers (small mammals and fish).

Scott Horton
Geophysicist/Computer Programmer