sheet drift

sheet drift

[′shēt ‚drift]
(geology)
An evenly spread deposit of glacial drift that did not significantly alter the form of the underlying rock surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
It has to be shifted each year because the polar ice sheet drifts about 30 feet annually.