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ripple mark

noun, Geology.
one of the wavy lines or ridges produced, especially on sand, by the action of waves, wind, or the like.
one of such forms preserved in sandstone or siltstone.
Origin of ripple mark
1825-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ripple-mark

ripple mark

one of a series of small wavy ridges of sand formed by waves on a beach, by a current in a sandy riverbed, or by wind on land: sometimes found fossilized on bedding planes of sedimentary rock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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