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

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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

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Example sentences
Rhomboid ripple mark, indicator of current direction and environment.
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