Tag Archives: fluvial landforms

HiRISE: Distinctive brightness

This full-resolution image is centered on a bright deposit at the end of a gully channel. The bright deposit does not seem to be present in an image acquired several years earlier than 2009, and is likely to be very … Continue reading

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HiRISE: Martian meanders and scroll-bars

This is a portion of an inverted fluvial channel in the region of Aeolis / Zephyria Plana, at the Martian equator. Channels become inverted when the sediments filling them become more resistant to erosion than the surrounding material. Here, the … Continue reading

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THEMIS: Branching channels of Arda Valles

THEMIS Image of the Day, December 29, 2016. Today’s false color image shows some of the many channels that make up Arda Valles. Their shape and meandering courses suggest that they were eroded by flowing streams or rivers. The THEMIS … Continue reading

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Karun Valles & its braided alluvial fan

Planetary Geomorphology Image of the Month, September 29, 2016: Solmaz Adeli (DLR, Institute of Planetary Research, Berlin). The Amazonian period on Mars, meaning roughly the last 3 Ga, is globally believed to have been cold and hyperarid [e.g., Marchant and … Continue reading

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Mars had lakes & streams long after early wet era

Lakes and snowmelt-fed streams on Mars formed much later than previously thought possible, according to new findings using data primarily from NASA’s Mars Reconnaissance Orbiter. The recently discovered lakes and streams appeared roughly a billion years after a well-documented, earlier … Continue reading

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Water, water, everywhere…?

Planetary Geomorphology Image of the Month, September 1, 2016: Susan J. Conway (CNRS and LPG Nantes, France). The similarity of water-formed landforms on Earth is often used as a key argument for the involvement of liquid water in shaping the surfaces … Continue reading

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THEMIS: Terra Sabaea channels

THEMIS Image of the Day, April 15, 2016. The northern margin of Terra Sabaea has numerous channels. This VIS image shows a portion of an unnamed channel on the margin of Terra Sabaea. More THEMIS Images of the Day by … Continue reading

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THEMIS: Terra Sabaea

THEMIS Image of the Day, February 26, 2016. This VIS image shows a small unnamed channel in Terra Sabaea. More THEMIS Images of the Day by geological topic.

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THEMIS: Gale Crater – false color

THEMIS Image of the Day, January 26, 2016. Today’s false color image shows part of the floor of Gale Crater, home of the Curiosity Rover. The location of the rover is to the north of this image. The dark material … Continue reading

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HiRISE: Ancient rivers

Early in Martian history, liquid water energetically carved the surface, forming channel systems that look remarkably similar to river valleys and drainage networks on Earth. Exactly how these channels formed—by rainfall, snowmelt, or seepage from underground springs — is often … Continue reading

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