Ripple marks
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In geology, ripple marks are sedimentary structures and indicate agitation by water or directly by wind.
Ancient wave ripple marks in sandstone, Moenkopi Formation, Capitol Reef National Park, Utah
Ripple marks at Ile Mavert, Hudson Bay
Tidal megaripples in the Random Formation in Newfoundland
Ripple marks in Cretaceous Dakota Formation, east side of Dinosaur Ridge. Scale bar on notebook is 10 cm.
Sedimentary structures
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Sedimentary structures include all kinds of features in sediments and sedimentary rocks, formed at the time of deposition.
Megaripple/dune, formed in the upper flow regime, from Utah
Wave ripple or symmetric ripple, from Permian rocks in Nomgon, Mongolia with "decapitation" of ripple crests due to change in current
Skolithos trace fossil (scale bar is 10 mm)
Soft sediment deformation (possibly a seismite) in Dead Sea sediments, Israel