Tag Archives: aeolian

Dunes ignoring small hills

A piece of Mars: What happens to dunes as they move over rough terrain? This is what a barchan looks like on a relatively flat surface. If the hills are smaller than the dune, then it does its best to ...

On Mars, the wind wins

A piece of Mars: This scene (600x450 m or 1969x1476 ft) is covered in small craters, formed by the splash of a larger crater nearby. They cover everything, even the bright ripples visible on the right. So the ripples ...

Wind eroded mantle

A piece of Mars: The curving ridge of a mountain has signs of many small landslides. Mantled on top of these is an older set of landslides that has been partially eroded away. The rippled edge of this older deposit ...

Bearded craters and dunes

A piece of Mars: This 600x450 m (1969x1476 ft) scene has a complex sedimentary history. How are bearded craters and dunes formed? They weren't always bearded. At some point, a deposit of bright material accumulated on this surface, and was ...

Wind, wind, impact(!), and then more wind…

A piece of Mars: Some time ago, something hit the ground on Mars and made this impact crater, right into a field of ripples. Stuff thrown up during the impact fell back down, burying the ripples with the gray ejecta ...

Textured gullies

A piece of Mars. These are gullies on a martian hillside (upslope is to the upper right). Water may be what forms the channels, carrying soil and rocks downslope. The textured pattern of the lower slope is caused by the ...

A way through

A piece of Mars: Wind ha blown the dark, rippled sand between jagged hills, from top to bottom in this frame (663 m or 2175 ft across). Regardless of the terrain, sand finds a way to get through -- just ...

Mars is watching you…

A piece of Mars: This looks like a pair of eyes looking at us. It's really some small brown hills, two of which (the "eyes") are surrounded by dark gray sand that has blown into scours as the wind interacts ...

How the wind turns

A piece of Mars: The two shadowed hills in the upper part of this frame (497x373 m or 1631x1224 ft across) rest on a flat plain covered in large ripples. On the plain the ripples are aligned north-south, formed perpendicular ...

What on Mars?

A piece of Mars: What on Mars is this (the scene is 600x450 m, or 0.37x0.28 mi)? It can be hard to tell. The lines are ridges of windblown dunes or ripples, the dark gray stuff is active sand blowing ...