Tag Archives: fluvial deposits

HiRISE: Channel deposits on Hellas Planitia

Channel deposits on Hellas Planitia. Beautiful Mars series.

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HiRISE: Layers in Galle Crater

This image shows a layered deposit in Galle Crater, located in the Southern cratered highlands. The geologic history of Galle Crater is not well constrained, and it contains a variety of features that have been interpreted as fluvial, lacustrine or … 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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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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HiRISE: Fine-branched ridges

This image shows numerous branching ridges with various degrees of sinuosity. These branching forms resemble tributaries funneling and draining into larger channel trunks towards the upper portion of the scene. The raised relief of these branching ridges suggests that these … Continue reading

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Gale Crater river carried pebbles tens of km as bedload on Peace Vallis alluvial fan

Rounded pebbles on Mars were transported for tens of kilometres in a river, suggests a new study published in Nature Communications [October 13, 2015]. This study makes use of a new technique that may help estimate the distance travelled by … Continue reading

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HiRISE: Geologic contact in Aeolus Dorsa

Geologic contact between fluvial deposits in Aeolus Dorsa — That blue is basaltic (volcanic) sand. Beautiful Mars series.

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