[meteorite-list] Carancas crater

[mmorgan at mhmeteorites.com]

All:
See the site (http://unb.ca/passc/ImpactDatabase).
On the first page you will find the criteria for inclusion within this database (which is the most comprehensive and well-researched list on the planet). Sikhote-Alin is listed, Carancas is not (yet?).  Also note Wabar and Haviland, both of which are termed "craters" and do fall within Adam's range of 5-20 m.

The term impact "pit" is not listed in the Glossary of Geology (Jackson, 1997, 4th ed.), and is thus likely a loosely-used definition.  Impact crater is listed in the Glossary and is defined as "a generally circular crater formed either by impact of a projectile on a planetary surface or by an experimental hypervelocity impact of a projectile into solid matter..."

I would hedge a bet that Carancas will be considered an impact crater.
 
Matt
----------------------
Matt Morgan
Mile High Meteorites
http://www.mhmeteorites.com
P.O. Box 151293
Lakewood, CO 80215 USA

-----Original Message-----
From: Michael Farmer <meteoriteguy at yahoo.com>

Date: Thu, 28 Feb 2008 09:40:39 
To:Adam Hupe <raremeteorites at yahoo.com>,Adam <meteorite-list at meteoritecentral.com>
Subject: Re: [meteorite-list] Carancas crater


I did not realize that the website you listed was the
definitive and final place which determines craters vs
pits. It seems that some of the top scientists in the
world think that it is a crater, perhaps you should
enlighten them.
Carancas is a crater, and I am not sure:), but I do
believe that the impact of a meteorite created it,
thus, I am still confused, but would that not tend to
suggest that it is meteoritic? Adam, I think
regardless of whether it is a common chondrite, the
simple fact that it exists forces science to
re-calculate its models for impact craters by
chondrites. So Carancas is extremely important. I
forsee papers written about Carancas for decades.
There will be no roof built, the crater is already
mostly destroyed (as I predicted that it would be,
thanks to those of us who went there, at least some
material was preserved).
Michael Farmer

--- Adam Hupe <raremeteorites at yahoo.com> wrote:

> Hi Mike and List Members,
> 
> To me, Carancas produced an "impact pit" which is a
> form of crater. I will concede the point that it is
> also a crater by other definitions, just not
> meteoritic.  The Sikhote Alin event also produced
> several impact pits that were described as such
> further constraining the meteoritic definition of an
> impact crater. 
> 
> Here is a great reference site that clearly defines
> crater sizes of 5-20 meters as "impact pits". 
> Carancas only produced a 13 meter mud hole squarely
> defining it as a pit. 
> 
> http://www.somerikko.net/old/geo/imp/listinfo.htm
> 
> Pretty soon, the Carancas impact pit it will be no
> more than a depression in the ground with urine,
> fecal
> matter and trash in it. Not to forget, a $90,000.00
> roof will be added on top of a rotted out and the
> most
> common type of ordinary chondrite in existence at
> the
> bottom. 
> 
> All the best,
> 
> Adam
> 
> 

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