Hello Larry McKee:
 
You may want to get in touch with Martha Zierden at the Charleston Museum.
She has a relatively recent publication out that utilized OCR dating, and
the technique seemed pretty effective.  Here is the citation:
 
Zierden, Martha
1996  Big House/Back Lot: An Archaeological Study of the Nathaniel Russel
House (38Ch100).  The Charleston Museum: Archaeological Contributions 25.
Prepared for the Historic Charleston Foundation.
 
Dane Magoon
Southern Illinois University Carbondale
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-----Original Message-----
From: Larry Mckee <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Friday, December 11, 1998 9:38 AM
Subject: OCR dating?
 
 
>Greetings,
>      Has anyone heard of a technique for dating sealed soil deposits,
perhaps
>specifically associated with building foundations and piers, known as OCR?
>Apparently this stands for Oxygen Carbon Ration, but I could be wrong.
>                 Best,
>                   Larry McKee
>                    The Hermitage
>                     Hermitage, TN
>