[meteorite-list] Crater question????

[John Keefner]

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 at 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
 >
 > ______________________________________________
 > Meteorite-list mailing list
 > Meteorite-list at meteoritecentral.com
 > http://six.pairlist.net/mailman/listinfo/meteorite-list
 >

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