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 ?
The middle, most argillaceous part of the Vormsi Stage contains the endemic saukrodictyid brachiopod Hulterstadia cor (Wiman), known previously only from erratic boulders on the Island of Oland (Sweden) (Wiman 1907; Harper 2000).
It is now used as a standard procedure of determining exposure ages of erratic boulders and the respective moraines (e.
A systematic census and analysis of erratic boulders and other tsunamigenic features along shorelines elsewhere in the world may provide a means for extending the historic record and thus more accurately assessing tsunami hazard.
Owens (Cardiff) review the distribution of the trilobite order Proetida in the Ordovician of Baltoscandia and in glacial erratic boulders found in northern Germany and adjacent areas.
The Company's Maguire field crew is credited with the identification of the preliminary exploration target, by discovery of erratic boulders at the close of the 2006 field season.