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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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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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