opus testaceum

An early Roman concrete masonry faced with fired brick.
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The Mons Testaceum, in the modern neighbourhood of Testaccio, is made entirely of fragments of broken storage jars of the Roman period piled up beside the ancient customs warehouses on the bank of the Tiber.
The monument is cut in the bedrock and the sides of the cut are covered by brick walls built in the opus testaceum technique (FIGURE 2).
It's faced in randomly arranged fragments of broken marble, recalling a decorative technique called opus testaceum found in ancient Roman masonry.