I'm no expert, but I think it refers to high relief strata:
DF] TRIPS ON THE ROCKS
www.dukelabs.com/Publications/PubsPdf/OTR14_StokesForest_sm... Format: PDF/Adobe Acrobat - View as HTML
by C Merguerian - 2010 - Related articles
it is an area displaying local high relief; and (2) the strata underlying the high-relief area are still horizontal; they have not been closely folded. ...
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Beached Whale at South Camp neaqr San Felipe, Baja
www.blueroadrunner.com/deadwhale.htm - Cached... drawing the eye to the high relief of the landscape's subcutaneous stratum, perhaps to show an alternative to a life of lipid chemistry. ...
Archaeological encyclopedia of the Holy Land - Google Books Result
books.google.com/books?isbn=0826485715...
Avraham Negev, Shimon Gibson - 2005 - Religion - 559 pages
All are carved in high relief. Much of the decorative repertoire is taken ... at the site: Strata III-II from Iron Age I and Stratum I to early Iron Age II. ...
Saludos
eski :))