Tag Archives: sediments

Valley network distribution supports true polar wander and an ancient ocean

[Editor’s note: From a paper by Ngai Ham Chan and three co-authors recently published in the Journal of Geophysical Research.] New Evidence of an Ancient Martian Ocean from the Global Distribution of Valley Networks • Surface deformation due to True … Continue reading

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Cross-bed geometry in upper Mt. Sharp

Planetary Geomorphology Image of the Month, August 1, 2018: One of the most environmentally diagnostic features of sedimentary rocks is cross-bedding, which occurs when sediment is transported by wind, water, or volcanic processes, resulting in horizontal strata composed of inclined … Continue reading

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HiRISE: Layers near Aeolis Mensae

Layers near Aeolis Mensae. Beautiful Mars series.

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HiRISE: On the contemplation of the stratigraphy of another planet

On the contemplation of the stratigraphy of another planet. 255  km above the surface. This image uses the infrared-red-blue filter of the HiRISE camera. Beautiful Mars series.

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HiRISE: Clays of Ladon Basin

Ladon Basin was a large impact structure that was filled in by the deposits from Ladon Valles, a major ancient river on Mars. These wet sediments were altered into minerals such as various clay minerals. Clays imply chemistry that may … Continue reading

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HiRISE: Eroded layers in Shalbatana Valles

Layers, probably sedimentary in origin, have undergone extensive erosion in this image of Shalbatana Valles, a prominent channel that cuts through Xanthe Terra. This erosion has produced several small mesas and exposed light-toned material that may differ in composition from … Continue reading

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Sublimation of water can levitate sediments for downslope movement

Scientists from The Open University (OU) have discovered a process that could explain the long-debated mystery of how land features on Mars are formed in the absence of significant amounts of water. Experiments carried out in the OU Mars Simulation … Continue reading

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HiRISE: Window into the past

The layered sedimentary deposits inside the giant canyons of Mars have puzzled scientists for decades. These light toned deposits have fine, horizontal laminations that are unlike the rugged rim rock of the Valles Marineris. Various ideas for the origin of … Continue reading

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HiRISE: A sequence of beauty in Terby Crater

The north-facing wall of a moat-like depression in the middle of Terby Crater exposes a beautiful 400 meter-high sequence of light-toned, repetitive sedimentary layers. These deposits are often obscured by darker-toned patches of material as well as ripples and dunes. … Continue reading

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HiRISE: Possible aqueous sediments in Hellas Planitia

Possible aqueous sediments in Hellas Planitia. Beautiful Mars series.

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