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.]
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