rimrock

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rimrock

(ˈrɪmˌrɒk)
n
(Geological Science) rock forming the boundaries of a sandy or gravelly alluvial deposit
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

rim•rock

(ˈrɪmˌrɒk)

n.
rock forming the natural boundary of a plateau or other rise.
[1855–60, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Walk the rimrocks with a shotgun, cast a fly for rainbows, ambush a turkey, break a few clays or prowl the backcountry roads with binoculars.
The northern slope dropped away endlessly--a steep, open slope for several hundred yards, then series after series of rimrocks and chutes.
I shot a good buck that had bedded below some rimrocks, but robbed of my anonymity, I'd been forced to change my hunting strategy, slow to a crawl, and lurk in the shadows.
We move on, across another sand and rock wash, up through rimrocks, achieving the top, listening, pushing on.
Opening morning found us glassing for bucks from about a quarter-way up the west side of a huge glacier-created canyon, to the rimrocks on the east side.