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Thank you David.

This has been very helpful to me.

Jack Cannon

----- Original Message ----- 
From: "David Smith" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, July 18, 2009 2:15 PM
Subject: Re: columns in layers


> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related 
> institutions.
> *****************************************************************************
>
> Here is more information on tree fossils, including the irrelevance of the
> Spirit Lake comparison.  The biggest issue is a confounding of the rate of
> deposition of a sedimentary formation (consisting of numerous beds) and 
> the
> rate of deposition of a single bed, which may be very rapid or very slow,
> depending on the sedimentary environment.
>
> http://www.talkorigins.org/faqs/polystrate/trees.html
>
> For a creationist view see http://www.apologeticspress.org/articles/184 
> This
> article is full of pseudo-citations (nearly self-referential links to 
> other
> creationist writers), and also follows the usual creationist practice of
> posing questions ("How could this be?" or "How could this not be?")  This
> sort of questioning can appear genuine to novice audiences, but is a
> non-scientific approach as there is never an independent hypothesis 
> advanced
> by the authors to explain the evidence.
>
> Dave Smith
>
> On Mon, Jul 13, 2009 at 2:35 PM, Jack W Cannon 
> <[log in to unmask]>wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>>
>> *****************************************************************************
>>
>> I wish to extend my thanks to both Marc and Erich for the explanations of
>> possible causes of vertical columns within sedimentation layers.  Geology 
>> is
>> one area that I have never had the opportunity to study.  So these
>> explanations are particularly helpful to me.
>>
>> Dr Harrub led into this subject matter with a picture of Spirit Lake 
>> after
>> the Mount St. Helens eruption.  There were a lot of logs (trees stripped 
>> of
>> their branches) floating in the lake.  He claimed that as these trees 
>> became
>> waterlogged and eventually sunk, they did so in an upright position and
>> remained upright as they settled on the bottom.  Since trunks do not last
>> very long, the sedimentation surrounding the trees could not be millions 
>> of
>> years old.  According to him, that proved his claim that all 
>> sedimentation
>> layers are the same age.
>>
>> Jack Cannon
>>
>>
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>
>
> -- 
> David L. Smith
> Da Vinci Science Center
> Allentown, PA
> http://www.davinci-center.org
>
> Please consider the environment before printing this email.
>
> Everything that needs to be said has already been said. But since no one 
> was
> listening, everything must be said again.  -- Andre Gide
>
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> For information about the Association of Science-Technology Centers and 
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> Check out the latest case studies and reviews on ExhibitFiles at 
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