Erratic blocks

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(Geol.) masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes.

See also: Erratic

References in classic literature ?
These elevated summits consist of rounded cones, between which the soil is bestrewn with erratic blocks of stone and gravelly bowlders.
Other astronomers have seen in these inexplicable rays a kind of moraines, rows of erratic blocks, which had been thrown up at the period of Tycho's formation.
He covers how erratic blocks caught the eye of science, glacier advances and icy theories 1810-1830, glacier and ice-age theories in the first half of the 1830s, the international reception of glacial theory, and the search for causes of the ice ages.