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 classic literature ?
Throughout a large part of the United States, erratic boulders, and rocks scored by drifted icebergs and coast-ice, plainly reveal a former cold period.
46 deg; erratic boulders have, also, been noticed on the Rocky Mountains.
At the best, in her most charitable frame of mind, she considered the statement of his views to be a caprice, an erratic and uncalled-for prank.
"That there did exist a certain compactum, or agreement, between Obed Batt, M.D., and Ishmael Bush, viator, or erratic husbandman," he said, endeavouring to avoid all offence in the use of terms, "I am not disposed to deny.
The train continued its erratic progress, sometimes stopping altogether for a time, with whistle blowing repeatedly; sometimes creeping along the metals as though feeling its way to safety.
She made the sombre crowd cheerful by her erratic and glistening ray, even as a bird of bright plumage illuminates a whole tree of dusky foliage by darting to and fro, half seen and half concealed amid the twilight of the clustering leaves.
Each pedestrian could see no halo but his or her own, which never deserted the head-shadow, whatever its vulgar unsteadiness might be; but adhered to it, and persistently beautified it; till the erratic motions seemed an inherent part of the irradiation, and the fumes of their breathing a component of the night's mist; and the spirit of the scene, and of the moonlight, and of Nature, seemed harmoniously to mingle with the spirit of wine.
We wondered why those parties happened to take their dinners at such erratic and extraordinary hours, for we never called at a time when an exemplary Christian would be in the least likely to be abroad on such an errand.
No longer were its movements erratic. With outstretched tail and foaming jaws it charged straight as an arrow, for the body of the thoat and the mighty creature of destruction that stood with forepaws upon the slate-grey side, waiting to defend its meat.
There was little change in the formation of the gorge; it still wound its erratic course between precipitous cliffs.
CALIFORNIA -- Twitter said Friday the account of chief executive Jack Dorsey had been "compromised" after a series of erratic and offensive messages were posted.
So, the effects of global warming (e.g., sea level rise and violent and erratic weather patterns) are much worse than predicted and happening right now.