[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
On Wed, 22 Mar 2000, Stanley Friesen wrote:
> At 09:59 PM 3/21/00 -0500, John Bois wrote:
> > > 2) Nonetheless, if a bolide hit, and apparently one
> > > quite definitely did, there were a lot of unlucky
> > > frogs on that day.
> >But there is _no_ evidence of this. How can you say ot happened if you
> >have no evidence.
> Actually, there is a *great* *deal* of evidence that a bolide struck the
> Earth at about 64 MYBP.
Sorry, I meant no evidence of a bad frog day.
And death of frogs at the immediate crater is a trivial event--as
relevant, say, as a frog being crushed by a falling branch. We are
talking about global effects. Sorry for the confusion.
> The debatable issue is whether the impact was, by itself, a *sufficient*
> cause for the total extinction of non-avian dinosaurs. (For instance, I
> suspect that the bolide was so effective only because the ecosystems of the
> Earth were already stressed from other causes, and the same bolide striking
> at, say, 34 MYBP would have had little long-term effect).
I agree with this. And such an approach leaves the issue of real
causality open. We, are, then, still in the hypothesis-forming stage.