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Related to ripple mark: Cross bedding
(Physical Geography) 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
1. one of the wavy lines or ridges produced, esp. on sand, by the action of waves, wind, or the like.
2. one of such forms preserved in sandstone or siltstone.