Help... Clay coating aging

[Clay Boy]

I have been doing some research for my school thesis and have been
studying 7 different pits ranging from QTerraces, QAlluvial Fans,
QFlood plains, and active flood plains, alluvial fans. we are trying
to rap up our information and are having a difficult time dating our
soils in the Qterraces, I have found a paper that talks about
discountinuous/continuous clay coatings and there ages, the only thing
is I haven't the slightest idea of what those actually are and cannot
find them anywhere. Can anyone please explain what a discontinuous/
continuos clay coating on pedologic faces is? From there I should be
able to get relative dates for several of my pits. Thanks, have a
great one.

Brandon Queen
University of North Carolina at Charlotte
Graduate Student

[yaalon]

Dear Brandon Queen,

In response to your question:

As you know clay skins or coatings on peds are observed in the field or in
micromorphological thin sections. They may start as discontinuous features
and grow/develop with tine to become more continuous pedological features
more easily recognized.
So there may be a relative time difference between discontinuous (early
formation) and continuous clay coatings (formed over longer time) which are
purely descriptive terms, but I doubt that any relative dates can be
assigned. to this process, depending on so many other environmental factors.
Good dating is by environmental isotopes. Look up the Stoops et al. book in
Micromorphology.and other similar publications.

Best wishes for your research,

Dan Yaalon

-------------------------------------------------
Prof. (emer.) Dan H. Yaalon
Institute of Earth Sciences
Hebrew University Givat Ram Campus
Jerusalem 91904, Israel
Fax : 972-2-5662581 or 02-5704411
E-Mail : yaa...@vms.huji.ac.il
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[М.Шицевалов М.Бронникова]

Dear Brandon Queen! In reality there were a singular attempts to asses relative dating basing on the development of clay coatings and the quantity of illuvial material in subtropical alluvial soil-sedimentary paleosequences: David F. Ufnar Clay coatings from a modern soil chronosequence: A tool for estimating the relative age of well-drained paleosols.// Geoderma 141 (2007) 181-200. The author made an attempt to correlate the % of clay coatings with OSL and IRSL dates obtained for the same sections. It worked quite well: he found linear relationship between the % of clay coatings and absolute age within wide time span for some cases. But! The rates of clay illuviation are certainly different in different conditions. And there is not much known about it. So, potentially clay cutans can be possibly used for the relative dating in paleopedology but much-much methodological work should be done before it.
With kind regards,
Maria Bronnikova

-----Original Message-----
From: Clay Boy <the...@yahoo.com>Department of Geography and Geology, University of Southern Mississippi, Hattiesburg, MS 39406
To: International paleopedology commission <paleop...@googlegroups.com>
Date: Mon, 7 Dec 2009 17:55:00 -0800 (PST)
Subject: [Paleopedology] Help... Clay coating aging

[FITZ]

Dear Brandon,

I do not think that we have the techniques to accurately date clay coatings.
All that we can say is that they are younger than
the material in which they are found. You might like to have a look at my
book "Soil Microscopy and Micromorphology" in
which I discuss various types of coatings and their internal changes with
time.

Yours sincerely,

E A FitzPatrick,

PS Perhaps you would liked to know that I visited North Carolina last year
in support of my grand daughter who represented the UK
in the Kids Golf competition.

--------------------------------------------------
From: "Clay Boy" <the...@yahoo.com>
Sent: Tuesday, December 08, 2009 1:55 AM

To: "International paleopedology commission"
<paleop...@googlegroups.com>

Subject: [Paleopedology] Help... Clay coating aging

> I have been doing some research for my school thesis and have been

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