Mathematics – Logic
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sci...210..895p&link_type=abstract
Science, vol. 210, Nov. 21, 1980, p. 895-897. Research supported by the National Research Council;
Mathematics
Logic
84
Geomorphology, Mars Surface, Planetary Evolution, Planetology, Valleys, Mariner 9 Space Probe, Mars (Planet), Mars Craters, Space Exploration, Mars, Valleys, Morphology, Distribution, Ages, Origin, Terrain, Formation, Erosion, Canyons, Topography, Craters, Impacts, Photographs, Data, Geology, Characteristics, Structure, Comparisons, Models, History, Evolution, Eolian Processes
Scientific paper
The article summarizes the geological and geomorphological evidence concerning the formation of the valley networks of Mars which were observed in the Mariner 9 and Viking Orbiter images. There is no clear evidence of direct fluid erosion in any Martian valley. The networks are diffuse and inefficient, with irregular tributary junction angles and large, undissected intervalley regions. The deeply entrenched canyons, with steep-walled amphitheater terminations suggest headward extension (sapping) by basal undermining and wall collapse. It is believed that valley formation has not occurred on Mars for billions of years because the size-frequency distributions of impact craters in these valleys and in the heavily cratered terrain which surrounds them are statistically insignificant.
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