Ice snow or glacial - Geophotography
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erratic (er-rat'-ic) n. A rock fragment carried by glacial ice, or by floating ice, deposited at some distance from the outcrop from which it was derived, and generally though not necessarily resting on bedrock of different lithology. Size ranges from a pebble to a house-size block See also: perched block;
exotic Istruc geoll. Syn: erratic block; erratic boulder; glacial erratic. adj. Transported by a glacier from its place of origin. Syn: traveled.
Glossary Of Geology Fifth Edition