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Re: K/T impact (was Re: [for some reason] Tim's theory)
On Tue, 15 May 2001, Tim Williams wrote:
> Only a trickle of avian diversity (and disparity) survivied the K/T
> boundary, in the form of the neornithines.
Since there is _no record_ of the extinction of enantiornithines, this
statement cannot be made.
> Certain mammals were hit hard (at least the marsupials). As for them "going
> up in smoke", see below.
Marsupial extinctions are also consistent with placental replacement
hypothesis. How to choose between the two?
> The extinctions percolated from the bottom of the food chains upward. The
> devastating effect that prolonged darkness and cold conditions (perhaps
> followed by elevated Greenhouse-like temperatures, as the ash and dust
> settled but the CO2 stayed up in the atmosphere) would have on life
> everywhere cannot be overstated.
Hypotheses should not be confused with facts.