ripple mark

ripple mark

noun Geology.
1.
one of the wavy lines or ridges produced, especially on sand, by the action of waves, wind, or the like.
2.
one of such forms preserved in sandstone or siltstone.

Origin:
1825–35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ripple mark is always a great word to know.
So is loam. Does it mean:
seepage of water into soil or rock
rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay
Collins
World English Dictionary
ripple mark
 
n
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 10th Edition
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