Tag Archives: polygonal terrain

Enigmatic clastic polygons on Mars

Planetary Geomorphology Image of the Month, February 1, 2018: Laura Brooker (Open University, Milton Keynes, UK). Polygonal ground of centimetre- to decametre-scale is one of the most common features found in cold-climate regions on Earth and on Mars. Polygonal shapes … Continue reading

Posted in Reports | Tagged , , , , , | Comments Off

HiRISE: Hexagons in icy terrain

Ground cemented by ice covers the high latitudes of Mars, much as it does in Earth’s cold climates. A common landform that occurs in icy terrain are polygons. Polygonal patterns form by winter cooling and contraction cracking of the frozen … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , | Comments Off

HiRISE: Within a crater in the Southern Highlands

Within a crater in the Southern Highlands. This is a very ancient crater, long filled-in. You can see polygonal patterns in the terrain, mainly due to the contraction of subsurface ice as the seasons change. Beautiful Mars series.

Posted in Reports | Tagged , , , , | Comments Off

HiRISE: Rectangles with wiggly sides

Ground that has a lot of water ice mixed with dirt tends to crack in polygonal patterns bounded by short straight channels. In the South Polar region of Mars this type of terrain may be covered by a seasonal polar … Continue reading

Posted in Reports | Tagged , , , , , , , , , | Comments Off

HiRISE: Polygonal network of exposed ridges

Polygonal network of erosionally exposed ridges. Beautiful Mars series.

Posted in Reports | Tagged , , , , , , , , | Comments Off

HiRISE: Frost-enhanced landscape

The arc of hills in this image is the rim of an old and infilled impact crater. The sediments that were deposited within the crater have since formed polygonal cracks due to repeated cycles of freezing and thawing. The process … Continue reading

Posted in Reports | Tagged , , , , , , , , | Comments Off

HiRISE: Polygonal fracturing on crater ejecta

Polygonal fracturing on ejecta from a crater in the Arabia region. Beautiful Mars series.

Posted in Reports | Tagged , , , , , , , , , | Comments Off

HiRISE: Polygons in an impact crater

The Slayer Time, Ancient of Days, come hither to consume. Polygons in an impact crater. Beautiful Mars series.

Posted in Reports | Tagged , , , , , , , , | Comments Off

HiRISE: Shield wall

Shield wall — Wonderful terrain the Martian South Pole, with terrific examples of sublimation and polygonal cracks from expansion and contraction due to seasonal changes. Beautiful Mars series.

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

HiRISE: Polygonal cracks meet south polar layered deposits

Exposure of south polar layered deposits. Beautiful Mars series.

Posted in Reports | Tagged , , , , , , , , , | Comments Off