<P> In geology, ripple marks are sedimentary structures (i.e. bedforms of the lower flow regime) and indicate agitation by water (current or waves) or wind . </P> <Ul> <Li> <P> Ripple marks in Cretaceous Dakota Formation, east side of Dinosaur Ridge . Scale bar on notebook is 10 cm . </P> </Li> <Li> <P> Ripple beds in the Wren's Nest National Nature Reserve, Dudley, England </P> </Li> <Li> <P> Wave / symmetrical ripple, Nomgon, Mongolia </P> </Li> <Li> <P> Cross-section through asymmetric climbing ripples, seen in the Zanskar Gorge, Ladakh, NW Indian Himalaya . Ripples climb when sediment fluxes in the flow are very high . </P> </Li> </Ul>

What do ripple marks in sedimentary rock mean