Tag Archives: inverted topography

HiRISE: Inverted and altered light-toned terrain in Sirenum Fossae

Inverted and altered light-toned terrain in Sirenum Fossae. Beautiful Mars series.

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HiRISE: Big fans

Alluvial fans are fan-shaped deposits emerging from regions of steep topography. Alluvial fans on Mars are thought to be ancient and record past episodes of flowing water. This image shows part of one of those fans, which has been eroded. … Continue reading

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HiRISE: Inverted crater west of Mawrth Vallis

This image captures details of an approximately 1-kilometer inverted crater west of Mawrth Vallis. A Context Camera image provides context for the erosional features observed at this site. The location of this HiRISE image is north of the proposed landing … Continue reading

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Inverted terrain shows ancient stream-flow details

River deposits exist across the surface of Mars and record a surface environment from over 3.5 billion years ago that was able to support liquid water at the surface. A region of Mars named Aeolis Dorsa contains some of the … 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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HiRISE: Transition from depressed to inverted channels in Gorgonum Basin

This image shows a transition from depressed to inverted channels in the Gorgonum Basin. In the darker terrain, there are two channels that display depressed topography. As these two channels cross into the underlying brighter terrain, the channels now stand … Continue reading

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HiRISE: An inverted crater

There is a circular feature in this observation that appears to stand above the surrounding terrain. This feature is probably an inverted crater: a once-normal appearing impact crater that was filled in with sediment. The fill became indurated, or hardened, … Continue reading

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HiRISE: North Hellas rock layers & sinuous ridge

North Hellas region layered rock and sinuous ridge exposures. Beautiful Mars series.

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HiRISE: Inverted terrain in Eridania Basin

The Eridania Basin is thought to have once contained a large sea. This image shows the Gorgonum Basin, which lies along the eastern edge of Eridania. Along this eastern boundary, the terrain is being eroded away to expose light-toned altered … Continue reading

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Inverted wadis on Earth: analogs for Mars

Planetary Geomorphology Image of the Month, February 1, 2016: Abdallah Zaki (Ain Shams University). The evolution of inverted topography on Earth and Mars can result from surface armouring of the channel, infilling of channels/valleys by lava flows, and cementation of … Continue reading

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