Tag Archives: alluvial fan deposits

HiRISE: Fan with inverted channels

This image shows inverted channels within a fan whose origin could be either fluvial (produced by the action of a stream) or alluvial (created by sedimentary deposits). If the fan is alluvial, then it formed on dry land. If the … Continue reading

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The largest delta on Mars?

Planetary Geomorphology Image of the Month, September 1, 2018: Jacob Adler (Arizona State University). Ancient river deltas are found in many locations on Mars [see Di Achile & Hynek, 2010 and references therein], and are formed as sediment drops out … Continue reading

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HiRISE: Mesa in Gale Crater

A mesa in Gale Crater. This is an intriguing delta (?) within Gale Crater, and this is also the first time we’ve imaged it. Beautiful Mars series. [More at links]

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HiRISE: Fans and valleys

An impact crater approximately 23 kilometers across is home to fan-shaped deposits that extend from the rim and sit on the interior crater floor. Thick beds with varying tone are exposed along the edge of the fan. Shallow valleys that … Continue reading

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HiRISE: Fans of Roddy Crater

Alluvial fans are found on Earth, Mars, and even Saturn’s moon, Titan. Roddy Crater on Mars is home to several large alluvial fans, which formed as water moved sediment from the mountainous crater rim and deposited it onto the flatter … Continue reading

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HiRISE: Fans in east Coprates Montes

Dark be the fans in east Coprates Montes. Beautiful Mars series. [More at links]

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Nirgal Vallis flow built an alluvial fan in Uzboi Vallis relatively recently

[Editor’s note: From a paper by Sharon Wilson and three co-authors recently published in the Journal of Geophysical Research.] • We identify and characterize a deposit (upper and lower units) on the floor of Uzboi Vallis near the confluence of … Continue reading

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HiRISE: Alluvial fan in Murray Crater

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: Alluvial fans in NE Mojave Crater

Alluvial fans in northeastern Mojave Crater. Mojave Crater is a perennial favorite of ours for the clear signs of these alluvial fans that might indicate it once rained on Mars a very long time ago. Beautiful Mars series. [More at links]

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Stepped fans and phyllosilicates on Mars

Planetary Geomorphology Image of the Month, April 1, 2018: Peter Grindrod (Natural History Museum, London, UK). A number of different studies have catalogued features on Mars that could be given the general heading of sedimentary fans… These features occur whenever … Continue reading

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