Mathematics – Logic
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2461t&link_type=abstract
Journal of Geophysical Research, vol. 80, June 10, 1975, p. 2461-2477. Research supported by the Natural Environment Research C
Mathematics
Logic
28
Cratering, Mariner Venus-Mercury 1973, Mercury (Planet), Planetary Mapping, Planetary Surfaces, Terrain Analysis, Geological Surveys, Photogrammetry, Photomapping, Spaceborne Photography
Scientific paper
A geologic terrain map of Mercury has been constructed by use of the photogeologic methods employed for the moon and Mars. The oldest and most widespread unit, intercrater plains, forms nearly level to rolling surfaces on which are superposed numerous secondary impact craters. This unit may represent a very old surface that predates the last heavy bombardment of the inner planets. The effects of this bombardment are recorded in a second widespread unit, heavily cratered terrain, consisting of closely spaced craters and basins from 30 km to several hundred kilometers in diameter. Units formed by excavation of the 1300-km-diameter Caloris basin are widespread on one hemisphere of the planet. The development of the Caloris basin was followed relatively quickly by emplacement of widespread plains materials, most of which are probably volcanic.
Guest John E.
Trask Newell J.
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