Sedimentary structures
Videos
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
Bedform
Videos
A bedform is a geological feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples include ripples and dunes on the bed of a r
Current ripples preserved in sandstone of the Moenkopi Formation, Capitol Reef National Park, Utah, United States.
Parting lineation, from lower left to upper right; Kayenta Formation, Canyonlands National Park.
Bedforms formed in sand in channels under unidirectional flow. Numbers correspond broadly to increasing flow regime, i.e., increasing water flow velocity. Blue arrows show schematically flow lines in the water above the bed. Flow is always from left to right.