This MOC image shows a flow knob of light-toned, layered rock exposed by erosion in the Iani Chaos region of Mars

This MOC image shows a flow knob of light-toned, layered rock exposed by erosion in the Iani Chaos region of Mars
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During periods in Mars' history when the planet had greater axial tilt, shifts in atmospheric circulation may have favored the extensive accumulation of snow in some locations. Protonilus Mensae is just such a site of extensive glaciation. We can see a flow of material through the valleys between a complex of small mesas. Streamlines and flow fronts appear as subtle ridges. Some ridges appear perpendicular to the mesas indicating flow direction. Others appear concentric to the mesas and parallel to the valleys, where debris and now-underlying ice bunched up and moved down valley. Deflation of the ice has led to a rich collection of small-scale features. Polygonal patterns of fractures and fissures may be related to a combination of thermal contraction cycles and overall subsidence of the surface. Larger fractures may be glacial crevasses, caused by differential flow rates in the underlying ice. Other more complex patterns of swirled pits and hummocks may result from the continual loss
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Images of the Cydonia region of Mars continue to be popular among visitors to the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC)web site. The two pictures (one annotated, the other not) are mosaics of two images from MGS MOC and one from the Mars Odyssey Thermal Emission Imaging System visible camera (THEMIS VIS). The mosaics highlight a Cydonia landform popularly known as the D&M Pyramid. It is located near 40.7°N, 9.6°W. Although it is not really shaped like a pyramid, the Cydonia landform is one of thousands of massifs, buttes, mesas, knobs, and blocks that mark the transition from the far northwestern Arabia Terra cratered highlands down to the northeastern Acidalia Planitia lowlands. Each block, whether shaped like a face, a pyramid, or simply a mesa, massif, or knob, is a remnant of the bedrock of northeastern Arabia that was left behind as erosion slowly degraded the terrain along this zone between the highlands and the lowlands. A few outcroppings of layers in this ancien
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Ancient Paleo-Dunes Battered by Impact Craters
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Image Number: 6145-44654556Royalty FreeCredit Line:Piemags/PL Photography Limited/SuperStockCollection:PL Photography LimitedStory:Martian Geological FeaturesContributor:PiemagsModel Release:NoProperty Release:NoResolution:2048×3088
Mars
Mars Global Surveyor (MGS)|