megaripples

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Dune — For other uses, see Dune (disambiguation). Erg Chebbi, Morocco … Wikipedia
Ripple marks — Ancient wave ripple marks in sandstone, Moenkopi Formation, Capitol Reef National Park, Utah … Wikipedia
Parting lineation — Parting lineation, from lower right to upper left; Kayenta Formation, Canyonlands National Park Parting lineation (also known as current lineation or primary current lineation) is a subtle sedimentary structure in which sand grains are aligned in … Wikipedia
giant ripple — A ripple that is more than 30 m in length; e.g., the jokulhlaup derived giant ripples in Camas Prairie, MT.; it usually exhibits superimposed megaripples. Compare: ripple mark. GG … Glossary of landform and geologic terms

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