sinkholes? Davias & Gilbride re Holocene ice comet fragment impacts
worldwide: Re: [NM Astronomy] Re: widespread Carolina Bay type craters: Pat
O'Connell: Rich Murray 2009.06.15

2009.06.15 Hi Pat, Thanks for your cogent suggestion.

The specific crater I cite shows convincing evidence of shattered and
blasted red sandstone bedrock on the west rim by the deepest part of the
elongated roughly north-south crater. There are chunks of the red sandstone
up to 1 m size scattered about within a mile or so.

Impacts will fracture bedrock, facilitating the evolution of ponds, springs,
sinkholes, and caves. Such thicks layers of horizontal fractured bedrock
are common in many places in roadcuts along I-25 from Santa Fe to Las Vegas,
New Mexico.

Mostly ice meteors at relatively low velocity impacts will generate high
temperature, high pressure steam explosions that will excavate craters
without creating much melting or vaporization of the ground rock or leaving
the kind of rocks and metals that are usually signatures of meteor impacts.

Last week I found a brother-sister team of scientific amateurs that have
located similar features all over the world, and offer a unified
interpretation, explained in a very long website with over a hundred Google
Earth images, namely, that sometimes huge, mostly ice meteors bearing a lot
of white silica sand have had 6-8 km/sec impacts at as little as 5 degrees
angle to the ground, producing ejecta that in turn produce characteristic
craters and mounds at various distances downrange, during the past 15,000
years:

http://www.perigeezero.org/treatise/index.html

Michael E. Davias <michael@...>;

Jeanette L. Gilbride <jeanette@...>;

In mutual service, Rich Murray

----- Original Message -----
From: "Pat OConnell" <gypkap@...>
To: <nm_astronomy@yahoogroups.com>
Sent: Monday, June 15, 2009 8:49 PM
Subject: [NM Astronomy] Re: widespread Carolina Bay type craters from Clovis
comet 12,900 Ya BP? -- 0.7 M long NS crater with fractured red sandstone on
SW rim, CR C 53A, 20 miles E of Las Vegas, NM: Rich Murray 2009.06.08


> --- In nm_astronomy@yahoogroups.com, "Rich Murray" <rmforall@...> wrote:
>>
>> widespread Carolina Bay type craters from Clovis comet 12,900 Ya BP? --
>> 0.7
>> M long NS crater with fractured red sandstone on SW rim, CR C 53A, 20
>> miles
>> E of Las Vegas, NM: Rich Murray 2009.06.08
>> http://groups.yahoo.com/group/AstroDeep/27
>>
>> Google Maps Satellite image link:
>>
<http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Las+Vegas,+New+Mexi\
co&sll=35.587894,-105.919641&sspn=0.000612,0.001608&ie=UTF8&ll=35.614186,-104.82\
7251&spn=0.078289,0.205822&t=h&z=13>
>>
>> I hope to arouse intense curiosity about the many rather obvious crater
>> fields of shallow impacts with a fractal distribution of sizes, that I've
>> scouted within a hundred miles of Santa Fe. Google Maps and Google Earth
>> make it easy to locate many such fields in the Northern Hemisphere.


>
> My other hobby besides astronomy is caving and cave science.
>
> While I haven't checked out the area you're talking about, consider that
> there is a large gypsum karst area running through the eastern edge of the
> state. There, sinkholes are created by water running through cracks in
> limestone and sandstone, that undermine the upper layers and cause
> sinkholes. The aerial photos may well be impacts, but I think sinkholes
> are more likely.
>
> Pat O'Connell
>
>> In mutual service, Rich Murray
>>
>> Rich Murray, MA 1967 (psychology), MIT BS 1964, history and physics,
>> 1943 Otowi Road, Santa Fe, New Mexico 87505
>> 505-501-2298 rmforall@...
>>
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>>
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>>
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