Rubble masonry

The wall at Grave Circle A, Helladic cemetery of Mycenae, Greece, 16th century BCE
Rubble masonry core of the unfinished Alai Minar in the Qutb complex, India, c. 1316 CE
Section of a regularly laid ashlar wall with rubble masonry fill

Rubble masonry or rubble stone is rough, uneven building stone not laid in regular courses. It may form an outer surface of a wall, or fill the core of a wall which is faced with unit masonry such as brick or ashlar. Some medieval cathedral walls have outer shells of ashlar with an inner backfill of mortarless rubble and dirt.

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