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 ?
Glacial erratic blocks and glaciodislocations of the north-western part of the Russian Plain.
The systemic irreconcilability of the various political, economic, and social realities took the form of cast organs, which were like erratic blocks within the interior of the space.
In addition, two erratic blocks discovered in the possible extension of the structure 75 meters to the west of the mineralized showing returned values of 8.