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Pedestal crater
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In planetary geology, a pedestal crater is a crater with its ejecta sitting above the surrounding terrain and thereby forming a raised platform. They form when an impact crater ejects material which f
Tikhonravov Crater floor in Arabia quadrangle, as seen by Mars Global Surveyor
Tikhonravov Crater floor in Arabia quadrangle, as seen by Mars Global Surveyor
Close-up of East side (right side) of previous image of pedestal crater showing polygons on lobe. Since the margin of the crater has lobes and polygon
Close-up of East side (right side) of previous image of pedestal crater showing polygons on lobe. Since the margin of the crater has lobes and polygons, it is believed there is ice under the protective top. Picture taken with HiRISE under HiWish program. Note: this is an enlargement of the previous image.
Pedestal craters form when the ejecta from impacts protect the underlying material from erosion. As a result of this process, craters appear perched a
Pedestal craters form when the ejecta from impacts protect the underlying material from erosion. As a result of this process, craters appear perched above their surroundings.
Drawing shows a later idea of how some pedestal craters form. In this way of thinking, an impacting projectile goes into an ice-rich layer—but no furt
Drawing shows a later idea of how some pedestal craters form. In this way of thinking, an impacting projectile goes into an ice-rich layer—but no further. Heat and wind from the impact hardens the surface against erosion. This hardening can be accomplished by the melting of ice which produces a salt/mineral solution thereby cementing the surface.
Oxia Palus quadrangle
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The Oxia Palus quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Oxia Palus quadrangle is also referred to as M
Image of the Oxia Palus Quadrangle (MC-11). The region contains heavily cratered highlands in the southeast which are intersected by several large out
Image of the Oxia Palus Quadrangle (MC-11). The region contains heavily cratered highlands in the southeast which are intersected by several large outflow channels terminating in the relatively smooth plains of Chryse basin in the northwest.
Erosion in Aram Chaos, as seen by THEMIS
Erosion in Aram Chaos, as seen by THEMIS
Erosion features in Ares Vallis, as seen by THEMIS
Erosion features in Ares Vallis, as seen by THEMIS
Becquerel (Martian crater) layers, as seen by HiRISE. Click on image to see fault.
Becquerel (Martian crater) layers, as seen by HiRISE. Click on image to see fault.