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Re: mass extinction
If the Cretaceous die off lost 75 percent, how big a percentage were
the later Cenozoic extinctions. I read somewhere off in the past fog
that some of them were pretty significant but I can't pull out the
reference from anywhere so dark. Obviously, climate change by any
cause along with the corresponding ecosystem impact causes well
niched forms to keel over. Nothing man has done could even come
close to the climatic change induced by a Cretaceous impactor, a huge
flood basalt or an ice age. For that fact, your basic Yellowstone
eruption would have some significant say on what lives and what
doesn't. That has happened 3 times in the last 2 million years.
Extinctions seem to be the course of things no matter what the cause.
BTW Phil, the RNC didn't give Crichton his facts but the other way
around. W actually asked him to the white house to talk about the
book. You should read it.
Frank (Rooster) Bliss
On Mar 20, 2006, at 6:18 PM, Phil Bigelow wrote:
On Mon, 20 Mar 2006 19:57:03 -0500 Jeff Hecht <email@example.com>
Remember that the Pleistocene lasted over two million years, and
during that time the flora and fauna had evolved to survive a series
of glacial/interglacial cycles of varying duration. Successive ice
ages did wipe out evidence of previous glacial/interglacial cycles,
but from what I've read and investigated, there isn't much evidence
of major megafaunal extinctions during previous interglacial thaws.
That's an important part of the evidence that humans were linked to
the Pleistocene extinction -- our widespread presence was something
that differed from prior interglacials.
One could argue that we are still "within" the Pleistocene. Past
interstades have lasted longer than 10,000 years...........