[meteorite-list] Impact Origin of Carolina Bays Argued For at 2007AGU Meeting

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Mon, 12 Mar 2007 14:20:05 -0700 (PDT)
Message-ID: <638785.81093.qm_at_web36913.mail.mud.yahoo.com>

Hi Paul, Sterling, all -

This dispute is exactly why I did not include the
Carolina Bays as evidence of impact in my book "Man
and Impact in the Americas". As to how the Bays
formed, it's still an open question.

On the other hand, the peoples remembered exactly how
the Alaskan and Siberian Mucks were formed, and they
also remembered other well evidenced impacts.

Now did we ever get a good date for the Campo de Cielo
fall?

good hunting,
Ed
E.P. Grondine
Man and Impact in the Americas


--- Paul <bristolia at yahoo.com> wrote:

>
> Sterling K. Webb wrote on Sun March 11, 2007
>
> >Hi, List,
> >
> >Thanks, Paul, for those links.
>
> You and the list might be interested to know that
> there is a competing session Carolina Bays. A more
> mainstream point of view on their formation will be
> given at the Geological Society of America
> Southeastern
> Section-56th Annual Meeting (29-30 March 2007) in a
> session titled "S6. Geology and Ecology of Carolina
> Bays" at:
>
>
http://gsa.confex.com/gsa/2007SE/finalprogram/session_18800.htm
>
> The paper in this session include 1. "The
> Sedimentology
> and Ages of Carolina Bays Sand Rims" by Dr. Ivestor
> at:
>
>
http://gsa.confex.com/gsa/2007SE/finalprogram/abstract_119179.htm
>
> This abstract states in part:
>
> "Water-lain pebbles intercalated with eolian sands
> indicate
> that these are typical shoreline deposits resulting
> from
> fluctuations in water level."
>
> "At individual bays where concentric rims occur,
> dating has
> established that rims are progressively younger
> toward the center
> of the bay, reflecting a regressive sequence and
> confirming that
> the bays are not single-event features but evolve as
> a result of
> processes active episodically over a long period of
> time. Active
> shorelines and associated eolian deposition occurred
> during
> marine isotope stage (MIS) 2 to late MIS 3 (~12 to
> 50 ka), MIS 4
> to very late MIS 5 (60-80 ka), and late MIS 6 (120
> to 140 ka)
> based on a cumulative total of 45 OSL dates. These
> age ranges
> also correspond with the ages of other eolian
> landforms in the
> Coastal Plain, including sand sheets and dunefields,
> and suggest
> a climatic threshold was crossed during the
> transition toward
> glacial stadials, initiating both bay and dune
> activity."
>
> Another abstract is "Geomorphic History of th
> Carolina Bays"
> by RAy Kaczorowski at:
>
>
http://gsa.confex.com/gsa/2007SE/finalprogram/abstract_118906.htm
>
> Needless to say, this activity will be quite fun to
> watch as
> all of these ideas are sorted out.
>
> Best Regards,
>
> Paul H.
>
>
>
>
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Received on Mon 12 Mar 2007 05:20:05 PM PDT