random rubble

British  

noun

1. masonry in which untooled stones are set without coursing

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Example Sentences

Under buildings that pottery and coins demonstrated to be from the early centuries B.C., the archaeologists found layers of what looked like random rubble.

From National Geographic

The chimneys and end-walls were generally built of stone, laid up as random rubble, with mortar composed of shell lime, sand, and gravel, and flakes of broken slate pounded fine.

From Project Gutenberg

It is a comparatively simple matter to trace the line of continuity from heavy squared ashlar blocks down through coursed and random rubble, to grouted indiscriminate rubble, and finally to concrete.

From Project Gutenberg