[meteorite-list] Holocene start impacts

From: Sterling K. Webb <sterling_k_webb_at_meteoritecentral.com>
Date: Sun, 6 Jul 2008 18:44:12 -0500
Message-ID: <07ac01c8dfc2$31f246b0$2346e146_at_ATARIENGINE>

Hi, EP, List,

    Mostly, I called it an "evidenceless" comet because
the argument has such weak and contradictory evidence
adavnced for it, and it's annoying. I was annoyed.

    A carbon-14 "bump" is proof something happened,
but the list of things that can produce one is long. It
allows the possiblity but does not restrict it to any one
possibility. A very long list.

    Likewise, the 514 microparticles found in Tunguska
trees with enrichments in heavy atoms of high atomic
weight (high-Z) suggest the soil was enriched in those
elements during the impact years. The authors think that
suggests a stoney asteroid. not a comet, but how would we
know what a comet's interior contains? No samples, in
contrast to asteroids of which we have plentiful samples.

    This evidence "implies;" it dosn't "prove" anything.
It could be from asteroids, or could be from comets, or
could be from cosmic dust, or could be from a volcano,
fer chrissake. (Remember, there's also a crypto-volcanic
theory of Tunguska, too.)

    And, notice from that website cited, they find NO
enrichment of iridium. It's not one of the 14 enriched
elements. No osmium, no other exotice elements we
use as markers of extraterrestriality. Why? Because the
sample is too small (514 microparticles), the instrument
xray spectrometer) too insensitive for the purpose, the
results are inconclusive.

    If there was more evidence, there would be more and
better results, or bigger evidence, or more dramatic
evidence... But there isn't. Hence, "evidenceless" comets
(or whatever).

    No fingerprints. Perfect Crime.


Sterling K. Webb
---------------------------------------------------------------------------
----- Original Message -----
From: "E.P. Grondine" <epgrondine at yahoo.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Saturday, July 05, 2008 11:20 AM
Subject: Re: [meteorite-list] Holocene start impacts


Hi Sterling, all

"Exactly how did this evidenceless Comet extinct
75% of the largest mammals? "

I hope those of you here not interested in this will forgive me yet another
message, one which should have been combined with the earlier one. Did I
mention that I've had a major stroke? - please forgive me this additional
message.

Sterling, I always enjoy your comments from your encyclopedic knowledge, and
your scepticism, and rigor, but speaking of science by press releases, but
those cometary impacts are not "evidenceless". Aside from the cometary
microspherule deposits, there's the C14 production hump at 10,900 BCE, which
is what started Firestone off on his quest.

Saying that it's "evidenceless" does not make it so. Why did your memory
fail you? In my case its due to stroke from undiagnosed diabetes, and I'd
like to remind everyone here to watch their diets and get their a1c's
checked.

Shifting to something more meteoritic, I'm hoping to get to those earlier
posts and hear more on those recent irons from SE North America. Perhaps
they'll throw some light on the "Hopewell" iron artifacts.

good hunting all,
E.P. Grondine
Man and Impact in the Americas









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Received on Sun 06 Jul 2008 07:44:12 PM PDT