[meteorite-list] Crater question????

From: John Keefner <jk_unlimited_at_meteoritecentral.com>
Date: Thu Nov 11 09:22:10 2004
Message-ID: <BAY101-F4VBw0f0gh0e00029484_at_hotmail.com>

The crater is only 20km in diameter! A pea shooter by geologic scale, and
only 3 million years old? There weren't any dinosaurs around to kill. In
comparison, the K/T impactor at Chixlub is 150-200km in diameter. The
Sudbury impact crater in Canada, where nickel sulfides are mined - and not
coincidentally - is around 200-250km. In fact it is so old, tectonic
stresses have deformed it into an oblong shape.

The evidence for impacts are pretty clear to a geologist with a petrographic
microscope and a chance to do some field work. I think the biggest hurdle is
convincing most geologists that sometimes stuff falls from the sky and makes
a big hole rather than the usual circular igneous intrusions.

Here is an up-to-date database of Earth impactors for those interested.
http://www.unb.ca/passc/ImpactDatabase/

Cheers,
John

From: "Tom AKA James Knudson" <peregrineflier_at_npgcable.com>
To: "Tom AKA James Knudson"
<peregrineflier_at_npgcable.com>,<Meteorite-list@meteoritecentral.com>
Subject: Re: [meteorite-list] Crater question????
Date: Tue, 9 Nov 2004 10:15:17 -0700

opps, link did not work, try this.
http://goafrica.about.com/library/gallery/afar/tanzania/blgallery-afar-tanza
nia1.htm

Thanks, Tom
peregrineflier <><
IMCA 6168
http://www.frontiernet.net/~peregrineflier/Peregrineflier.htm
----- Original Message -----
From: "Tom AKA James Knudson" <peregrineflier_at_npgcable.com>
To: <Meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, November 09, 2004 10:13 AM
Subject: [meteorite-list] Crater question????


> Hello List, It seems that every meteorite made crater was first thought
to
> be volcanic, including the craters on the moon. We all know what
Barringer
> had to go through to prove meteor crater was in fact a meteor made
crater.
> If you compare the crater pictured in this link with the craters on page
152
> in your rocks from space book, they look quite a bit a like. I am
wondering
> if anyone ever searched for evidence of this crater being meteoric as
> apposed to volcanic? It would make a fine dinosaur killer!
>
>
hthttp://goafrica.about.com/library/gallery/afar/tanzania/blgallery-afar-tan
> zania1.htm
>
> Thanks, Tom
> peregrineflier <><
> IMCA 6168
> http://www.frontiernet.net/~peregrineflier/Peregrineflier.htm
>
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> Meteorite-list mailing list
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Received on Thu 11 Nov 2004 09:21:33 AM PST