Re: Armadillos at the K/T!

["David Marjanovic" <david.marjanovic@gmx.at>]

----- Original Message -----
From: "John Bois" <jbois@umd5.umd.edu>
Sent: Saturday, October 13, 2001 1:03 PM


> But then the question becomes more
> interesting: why some groups hit and not others?

There have been endless arguments about this, onlist at least since 1994.
Preferred ideas include big vs. small, green vs. brown food chains,
different habitats that may shield against acid rain etc. or not... save to
say the untestable susceptibility to pyrotoxins which is said to differ a
lot among living animals.

> And, why was it just one
> body plan that was wiped out forever?

_Please_ tell me what dinosaurs, except Neornithes, have in common with
mosasaurs (but not many other squamates), ammonites, rudists and
inoceramids.

> And in what way was the biota
> structured such that a hit at this time may have had very different
> effects than a hit at some earlier time.

What hit at what earlier time?
If you mean the Tr-J boundary -- sure the biota was very different then...