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.
Megaripple from Utah
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.
Transverse aeolian ridges
Videos
Transverse aeolian ridges are visually bright features commonly found in topographic depressions on Mars. These small-scale and relict bedforms were first seen in narrow-angle images from the Mars Orb
Close-up of yardangs, as seen by HiRISE under HiWish program. Arrows point to sand ridges that are called "transverse aeolian ridges" (TAR's).
Close, color view of unusual transverse aeolian ridges, TAR's, as seen by HiRISE under HiWish program These features may have had variable local winds to make the wavy tops.
Close view of TAR's with waves, as seen by HiRISE under HiWish program
Close, color view of TAR's in a channel,as seen by HiRISE under HiWish program Only part of the image is in color because HiRISE only takes a 1 km wide color strip.