Bedform
![Current ripples preserved in sandstone of the Moenkopi Formation, Capitol Reef National Park, Utah, USA.](/Images/godic/202412/23/Ripple_marks_in_Moenkopi_Formation_rock_off_of_Capitol_Reef_Scenic_Drive25610.jpeg")
![Dimensional phase diagram for combined flows. Relationships of combined-flow bed-phases stability fields in a plot of Oscillatory vs Unidirectional velocity.[2]:1](/Images/godic/202412/23/Perillo2013_Bedforms_Phase_Diagram_Combined_Flows5610.png")
![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.](/Images/godic/202412/23/page1-500px-Bedforms_under_various_flow_regimes.pdf5610.jpg")
![Parting lineation, from lower left to upper right; Kayenta Formation, Canyonlands National Park.](/Images/godic/202412/23/PartingLineation5610.JPG")
A bedform is a 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 river. Bedforms are often preserved in the rock record as a result of being present in a depositional setting. Bedforms are often characteristic to the flow parameters, and may be used to infer flow depth and velocity, and therefore the Froude number.