[meteorite-list] RE: Moqui Marbles

From: Rob and Colleen <iguana_at_meteoritecentral.com>
Date: Thu Apr 22 09:44:35 2004
Message-ID: <3A9E9C53.C5910620_at_pcez.com>

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Moqui Marbles aka Ohio Meteorites. Get yours on eBay now.

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=564933699
Rob Wesel


Matt Morgan wrote:

> Hi Robert:
> I've collected Mogui Marbles myself in Utah a few years back. Your
> explanantion of them as concretions is the one that I've always heard, and
> never had reason to doubt it. As far as an impact explanation goes, I am
> highly suspect. I did have a thin section made of a couple of them at the
> time. No evidence of impact was found, and I would have found it if the
> silica or any mineral for that matter appeared to have been "molten". I
> could see that one would think this since the grains are coated, usually by
> calcite which acts as the bonding agent. Occasionally, at the center of a
> concretion, there may be a small piece of organic detritus. This was the
> substrate that the other grains adhered to. Anyway, the area didn't look
> like an impact site, nor was there any evidence in the marbles themself.
> Thanks for bringing this up!
>
> Matt
>
> ----------
> Matt Morgan
> Mile High Meteorites
> http://www.mhmeteorites.com
> P.O. Box 151293
> Lakewood, CO 80215 USA
>
> -----Original Message-----
> From: Robert Verish [mailto:bolidechaser_at_yahoo.com]
> Sent: Wednesday, February 28, 2001 8:07 PM
> To: mmorgan_at_mhmeteorites.com
> Cc: meteorite-list_at_meteoritecentral.com
> Subject: Moqui Marbles
>
> REF: http://www.rocksnstuff.com/specimens/moqui.htm
>
> Hello Matt,
>
> Last weekend I had a display case at the San Fernando
> Gem Fair in which I would show a meteorite, and then
> right beside it, a look-a-like meteor-wrong. One of
> these meteor-wrongs that I had displayed was a "Moqui
> Marble", which I had labeled as a "limonite/hematite
> concretion in sandstone". My explanation for how
> these stones were formed started a lively debate among
> the rockhounds in attendance at the show.
>
> What I would like to ask you is what do you know about
> the origins of these remarkably similar-shaped stones?
> I know Dave Freeman has a comment or two that he
> could make about these stones, but since you have been
> doing impact-related field work close to this area, I
> thought I would give you first crack at this topic.
>
> It just so happens that one of our own brethren
> [geologist] has muddied the waters, regarding the
> origins of these stones. ("My sediments exactly."
> said another geologist friend of mine.;-)
>
> Here is what he had to say regarding these stones, at
> this URL:
>
> http://www.rocksnstuff.com/specimens/moqui.htm
>
> "This material was formed in an impact site 12 miles
> east of Escalante UT in an area known as 'Big Spencer
> Flat'. The 'marbles' are composed of millions of
> molten spheres condensing on sand grains that bumped
> into and joined with other grains to form small
> spheres that joined with others to become even larger,
> with the hematite/silica coating always moving to the
> outside, but leaving a thin coat on most sand grains
> inside.
>
> "Some larger spheres cooled below the melting point
> during this process, so all steps of it can be seen.
> Some 'marbles' landed in sand, others in limestone,
> and
> some have joined in almost every way imaginable. Most
> of the crater has eroded away, but the remnants of
> dikes created in the impact are still visible.
>
> "The principle collecting area is in the new Escalante
> Monument, but material was deposited on top of eroded
> Navajo Sandstone as far as Lake Powell. I have yet to
> determine if reports from Scofield Reservoir could be
> the same formation, or a different impact. I am sure
> the same process has produced 'Indian Paint Pots' in
> sandstones from many time frames all around the world,
> and are much like 'tektites.'"
>
> The above quote is from Dave Cosby, a geologist who
> has been doing some research on the Utah area where
> Moqui Marbles are found. Dave believes that the
> uniformly shaped stones were the result of a meteorite
> impact in that area.
>
> While we're on this subject, here is a "heads-up" for
> the members of our eBay "Wrong Squad" - at these URLs:
>
> <http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=564933699>
>
> and
>
> <http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=564933715>
>
> __________________________________________________
> Do You Yahoo!?
> Get email at your own domain with Yahoo! Mail.
> http://personal.mail.yahoo.com/
>
> _______________________________________________
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> Meteorite-list_at_meteoritecentral.com
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<HTML>
Moqui Marbles aka Ohio Meteorites. Get yours on eBay now.

<P><A HREF="http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem">http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem</A>&amp;item=564933699
<BR>Rob Wesel
<BR>&nbsp;

<P>Matt Morgan wrote:&nbsp;
<BLOCKQUOTE TYPE=CITE>Hi Robert:
<BR>I've collected Mogui Marbles myself in Utah a few years back.&nbsp;
Your
<BR>explanantion of them as concretions is the one that I've always heard,
and
<BR>never had reason to doubt it. As far as an impact explanation goes,
I am
<BR>highly suspect.&nbsp; I did have a thin section made of a couple of
them at the
<BR>time. No evidence of impact was found, and I would have found it if
the
<BR>silica or any mineral for that matter appeared to have been "molten".&nbsp;
I
<BR>could see that one would think this since the grains are coated, usually
by
<BR>calcite which acts as the bonding agent. Occasionally, at the center
of a
<BR>concretion, there may be a small piece of organic detritus.&nbsp; This
was the
<BR>substrate that the other grains adhered to.&nbsp; Anyway, the area
didn't look
<BR>like an impact site, nor was there any evidence in the marbles themself.
<BR>Thanks for bringing this up!

<P>Matt

<P>----------
<BR>Matt Morgan
<BR>Mile High Meteorites
<BR><A HREF="http://www.mhmeteorites.com">http://www.mhmeteorites.com</A>
<BR>P.O. Box 151293
<BR>Lakewood, CO 80215 USA

<P>-----Original Message-----
<BR>From: Robert Verish [<A HREF="mailto:bolidechaser_at_yahoo.com">mailto:bolidechaser@yahoo.com</A>]
<BR>Sent: Wednesday, February 28, 2001 8:07 PM
<BR>To: mmorgan_at_mhmeteorites.com
<BR>Cc: meteorite-list_at_meteoritecentral.com
<BR>Subject: Moqui Marbles

<P>REF:&nbsp; <A HREF="http://www.rocksnstuff.com/specimens/moqui.htm">http://www.rocksnstuff.com/specimens/moqui.htm</A>

<P>Hello Matt,

<P>Last weekend I had a display case at the San Fernando
<BR>Gem Fair in which I would show a meteorite, and then
<BR>right beside it, a look-a-like meteor-wrong. One of
<BR>these meteor-wrongs that I had displayed was a "Moqui
<BR>Marble", which I had labeled as a "limonite/hematite
<BR>concretion in sandstone".&nbsp; My explanation for how
<BR>these stones were formed started a lively debate among
<BR>the rockhounds in attendance at the show.

<P>What I would like to ask you is what do you know about
<BR>the origins of these remarkably similar-shaped stones?
<BR>&nbsp;I know Dave Freeman has a comment or two that he
<BR>could make about these stones, but since you have been
<BR>doing impact-related field work close to this area, I
<BR>thought I would give you first crack at this topic.

<P>It just so happens that one of our own brethren
<BR>[geologist] has muddied the waters, regarding the
<BR>origins of these stones.&nbsp; ("My sediments exactly."
<BR>said another geologist friend of mine.;-)

<P>Here is what he had to say regarding these stones, at
<BR>this URL:

<P><A HREF="http://www.rocksnstuff.com/specimens/moqui.htm">http://www.rocksnstuff.com/specimens/moqui.htm</A>

<P>"This material was formed in an impact site 12 miles
<BR>east of Escalante UT in an area known as 'Big Spencer
<BR>Flat'. The 'marbles' are composed of millions of
<BR>molten spheres condensing on sand grains that bumped
<BR>into and joined with other grains to form small
<BR>spheres that joined with others to become even larger,
<BR>with the hematite/silica coating always moving to the
<BR>outside, but leaving a thin coat on most sand grains
<BR>inside.

<P>"Some larger spheres cooled below the melting point
<BR>during this process, so all steps of it can be seen.
<BR>Some 'marbles' landed in sand, others in limestone,
<BR>and
<BR>some have joined in almost every way imaginable. Most
<BR>of the crater has eroded away, but the remnants of
<BR>dikes created in the impact are still visible.

<P>"The principle collecting area is in the new Escalante
<BR>Monument, but material was deposited on top of eroded
<BR>Navajo Sandstone as far as Lake Powell. I have yet to
<BR>determine if reports from Scofield Reservoir could be
<BR>the same formation, or a different impact. I am sure
<BR>the same process has produced 'Indian Paint Pots' in
<BR>sandstones from many time frames all around the world,
<BR>and are much like 'tektites.'"

<P>The above quote is from Dave Cosby, a geologist who
<BR>has been doing some research on the Utah area where
<BR>Moqui Marbles are found.&nbsp; Dave believes that the
<BR>uniformly shaped stones were the result of a meteorite
<BR>impact in that area.

<P>While we're on this subject, here is a "heads-up" for
<BR>the members of our eBay "Wrong Squad" - at these URLs:

<P>&lt;<A HREF="http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=564933699">http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&amp;item=564933699</A>>

<P>and

<P>&lt;<A HREF="http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=564933715">http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&amp;item=564933715</A>>

<P>__________________________________________________
<BR>Do You Yahoo!?
<BR>Get email at your own domain with Yahoo! Mail.
<BR><A HREF="http://personal.mail.yahoo.com/">http://personal.mail.yahoo.com/</A>

<P>_______________________________________________
<BR>Meteorite-list mailing list
<BR>Meteorite-list_at_meteoritecentral.com
<BR><A HREF="http://www.pairlist.net/mailman/listinfo/meteorite-list">http://www.pairlist.net/mailman/listinfo/meteorite-list</A></BLOCKQUOTE>
&nbsp;</HTML>

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Received on Thu 01 Mar 2001 02:00:35 PM PST


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