Tag Archives: University of Arizona

HiRISE: Within an inverted impact crater

Posted on June 5, 2018 by rburnham

Within an inverted impact crater in Vastitas Borealis. This particular crater is characterized by a central deposit of positive relief with a subdued rim as a result of sublimation in the surrounding territory. A comprehensive study of inverted impact craters … Continue reading →

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HiRISE: Bedrock exposed in Hale Crater’s rim

Posted on June 1, 2018 by rburnham

Hale Crater is a large impact crater (more than 100 kilometers) with a suite of interesting features such as active gullies, active recurring slope lineae, and extensive icy ejecta flows. There are also exposed diverse (colorful) bedrock units. NB: North … Continue reading →

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HiRISE: Corduroy dunes

Posted on May 31, 2018 by rburnham

Corduroy dunes. The permanent polar cap of Mars is encircled by sand dunes and looking like pulled threads, these dunes march across a fabric of patterned ground. At this time of the Martian year they are free of the seasonal … Continue reading →

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HiRISE: Patches of snow

Posted on May 30, 2018 by rburnham

The North Pole of Mars is surrounded by a vast sea of sand dunes. In this dune field, the dunes are covered by a seasonal cap of dry ice in the winter. In early Martian summer, at the time we … Continue reading →

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HiRISE: A new impact crater

Posted on May 29, 2018 by rburnham

MRO keeps finding new impact sites on Mars. This one occurred within the dense secondary crater field of Corinto Crater, to the north-northeast. The new crater and its ejecta have distinctive color patterns. Once the colors have faded in a … Continue reading →

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HiRISE: Pits galore near Kasei Valles

Posted on May 29, 2018 by rburnham

Pits galore near Kasei Valles. These are located near the edge of a lava outflow region, for which there is evidence of subsurface tube flows. Beautiful Mars series. [More at links]

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HiRISE: Stair-stepped hill in central Arabia Terra

Posted on May 25, 2018 by rburnham

Stair-stepped hill in central Arabia Terra. Stratified material eroded so as to look something like a wedding cake. A cliff-bench slope expression, apparently mantled with dust, each layer is roughly the same thickness as the next. Beautiful Mars series. [More … Continue reading →

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HiRISE: Of sand, rock, and dust

Posted on May 24, 2018 by rburnham

Of sand, rock, and dust. There is some wonderful stratigraphy on display here in Meridiani Planum. Beautiful Mars series. [More at links]

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HiRISE: Alluvial fan in Murray Crater

Posted on May 23, 2018 by rburnham

Alluvial fan in Murray Crater. Alluvial fans are among the strongest lines of evidence that liquid water once flowed on the surface of Mars. Beautiful Mars series. [More at links]

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HiRISE: Inverted channels

Posted on May 22, 2018 by rburnham

Inverted channels at the boundary of highlands and intercrater plains. This image targets inverted channels located at the boundary between Noachian highlands and Noachian intercrater plains bedrock. These channels are 200 to 500 meters wide, implying substantial fluvial activity. High-resolution … Continue reading →

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