Tag Archives: dunes

HiRISE: Contrasting colors of crater dunes & gullies

Gullies are relatively common features in the steep slopes of crater walls, possibly formed by dry debris flows, movement of carbon dioxide frost, or perhaps the melting of ground ice. This example shows a section of crater wall from the … Continue reading

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THEMIS: Lines of dunes in Noachis Terra crater

THEMIS Image of the Day, Februrary 2, 2017. This VIS image shows sand dunes on the floor of an unnamed crater in Noachis Terra. Since Mars is universally dusty, the darker tone of the dunes shows they are relatively free … Continue reading

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THEMIS: Dune field in Hale Crater

THEMIS Image of the Day, February 1, 2017. Today’s VIS image shows a field of sand dunes on the floor of Hale Crater. Hale Crater is located in Noachis Terra north of Argyre Planitia. More THEMIS Images of the Day … Continue reading

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HiRISE: Dunes in northern summer

This dune field formed near the base of the North Polar cap. Dunes require a source of loose particulate material to form. The source of the northern dune fields around the polar cap may be from the layers of dusty … Continue reading

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THEMIS: Field of dunes in Sumgin Crater

THEMIS Image of the Day, January 30, 2017. Today’s VIS image shows sand dunes on the floor of Sumgin Crater. The crater is located in Noachis Terra north of Argyre Planitia. The dunes’ darker tone suggests they are relatively dust-free … Continue reading

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THEMIS: Crater channels, gullies, dunes & a pit

THEMIS Image of the Day, January 25, 2017. This VIS image shows part of an unnamed crater in Terra Cimmeria. The crater rim is dissected by gullies, and the central pit has several channels entering from the higher elevation of … Continue reading

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HiRISE: Changing dunes of Wirtz Crater

The large dark feature is a classic Martian sand dune. Most sand on Earth is made from the mineral quartz, which is white and bright. On Mars, most sand is composed of dark basalt, a volcanic rock. For this reason, … Continue reading

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HiRISE: Landforms at end of Her Desher Vallis

Landforms at west end of Her Desher Vallis. Beautiful Mars series.

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THEMIS: Gale Crater mound’s northern side

THEMIS Image of the Day, January 20, 2017. Today’s false color image shows part of the floor of Gale Crater and the northern side of Mt. Sharp (Aeolis Mons). The blue-colored areas on the crater floor are likely dunes made … Continue reading

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THEMIS: Waves of dunes in Rabe Crater

THEMIS Image of the Day, January 18, 2017. Today’s false color image shows part of the sand dune field on the floor of Rabe Crater. (More on Rabe Crater here.) The THEMIS VIS camera contains 5 filters. The data from … Continue reading

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