Opus incertum (`irregular work`) was an ancient Roman construction technique, using irregular shaped and random placed uncut stones or fist-sized tuff blocks inserted in a core of Opus caementicium. Initially it consisted of more careful placement of the coementa (rock fragments and small stones mixed with concrete), making the external surface .....
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http://en.wikipedia.org/wiki/Opus_incertum
(from the article `architecture, Western`) ...is, ordinary stone walling—was used as a facing especially for important public buildings under the earlier empire (for example, the exterior of ...
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http://www.britannica.com/eb/a-z/o/25
Opus incertum is a kind of ancient masonry employed in building walls, in which the stones were not squared nor laid in courses, similar to rubblework.
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http://www.probertencyclopaedia.com/browse/TO.HTM
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