random rubble

British  

noun

1. masonry in which untooled stones are set without coursing

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Example Sentences

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 Lippincott's Magazine, November 1885 by Various

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 Scientific American Supplement, No. 643, April 28, 1888 by Various