Tag Archives: fluvial landforms

THEMIS: Auqakuh Vallis

THEMIS Image of the Day, November 10, 2015. Today’s VIS image shows a portion of Auqakuh Vallis, which dissects the northern margin of Terra Sabaea. More THEMIS Images of the Day by geological topic.

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HiRISE: Discontinuous sinuous ridge

A discontinuous sinuous ridge on the fourth planet from Sol. Beautiful Mars series.

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HiRISE: Channel system & patterned ground near Hellas

In this image, we explore the southwestern floor of a 50-kilometer diameter unnamed crater, about 100 kilometers northeast of Hellas Basin. The crater’s rim is breached (see Google context image below) on both the north and south by a valley … Continue reading

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HiRISE: Searching for clinoforms in a possible delta

A delta is a pile of sediment dumped by a river where it enters a standing body of water. Evidence for deltas that formed billions of years ago on Mars has been mounting in recent years. One line of evidence … Continue reading

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THEMIS: Channel and delta

THEMIS image of the Day, July 1, 2015. This VIS image shows two channels. The channel in the center of the image ends in a crater, where it has created a delta deposit. These unnamed craters and channels are located … Continue reading

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HiRISE: Streamlined feature

Streamlined feature created by wind (aeolian) or fluvial processes? Note also the thin dune crests running from top to bottom. Beautiful Mars series.

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HiRISE: Bar and pit where valley enters crater

So, a valley enters a crater bar… Valley entering northern mid-latitude crater. Beautiful Mars series.

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HiRISE: Fill or mantling material in a crater

This observation targets some unknown fill or mantling material within valleys on a crater floor and within a central pit. High resolution imagery can help determine what this material may be (e.g., ice-rich fill, dust, or other mantling unit?) and … Continue reading

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HiRISE: Sinuous ridge on Orson Welles bajada

Alluvial fans are piles of debris dumped by rivers when they emerge from the mountains and enter a mostly dry valley. A bajada (such as this example named after the famous American filmmaker) consists of a series of coalescing alluvial … Continue reading

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HiRISE: Embayment in tectonized fluvial terrain

This highly tectonized terrain (meaning it possesses many faults) has its low-lying areas filled with some form of younger material. This particular fill is what geologists call “embayment.” This observation helps scientists unravel the relative timing of the emplacement of … Continue reading

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