erratic

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erratic

a piece of rock that differs in composition, shape, etc., from the rock surrounding it, having been transported from its place of origin, esp by glacial action

erratic

[ə′rad·ik]
(geology)
A rock fragment that has been transported a great distance, generally by glacier ice or floating ice, and differs from the bedrock on which it rests.
References in periodicals archive ?
Indeed, in the year before, this had been virtually spelled out in advance in a 'Festrede' Seelenstarke ist Herrschaft uber sich selbst (1777), which extends rational self-control over thoughts, feelings, passions, and actions, an erratic block in a philosophy where such stress is laid on the psychophysical factors that can undermine self-control.
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.
Glacial erratic blocks and glaciodislocations of the north-western part of the Russian Plain.