Mathematics – Logic
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..201p&link_type=abstract
Nature (ISSN 0028-0836), vol. 327, May 21, 1987, p. 201-204.
Mathematics
Logic
23
Ariel, Planetary Craters, Planetary Geology, Satellite Surfaces, Terrain, Uranus Satellites, Distribution (Property), Planetary Evolution, Uranus, Satellites, Ariel, Terrain, Craters, Frequency, Surface, Maps, Features, Distribution, Size, Time Scale, Comparisons, Geology, Plains, Photographs, Diagrams, Morphology, Ridges, Topography, Diameter, Age, Resurfacing, Formation, Grabens, Stratigraphy, Endogenic Effects, Spacecraft Observations, Voyager 2, Models, Differentiation
Scientific paper
The geological terrain recognized on Ariel using Voyager data is briefly discussed. Crater-size frequency data and surface morphology indicate that Ariel has been completely resurfaced since its accretion. The cratered terrain, the oldest surface on Ariel, may have been the one formed during this initial global resurfacing. Subsequently, Ariel has been partly resurfaced, as reflected by the ridged terrains and the plains. Similar crater frequencies for terrains other than the plain indicate that they are of similar age and formed over a relatively brief period of time. The plains are the youngest unit observed on Ariel. Graben development began before plains formation, as indicated by the presence of plains material partially filling some grabens.
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