Mathematics – Logic
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...13....9o&link_type=abstract
(Lunar Science Institute, Symposium on Origin and Evolution of the Lunar Regolith, Houston, Tex., Nov. 13-15, 1974.) The Moon, v
Mathematics
Logic
12
Cratering, Lunar Craters, Lunar Maria, Ballistic Trajectories, Deposits, Lunar Evolution, Lunar Geology, Lunar Photographs, Lunar Surface, Volcanology
Scientific paper
Material is ejected from impact craters in ballastic trajectories; it impacts first near the crater rim and then at progressively greater ranges. Ejecta from craters smaller than approximately 1 km are laid predominantly on top of the surrounding surface. With increasing crater size, more and more surrounding surface will be penetrated by secondary cratering action, and these preexisting materials will be mixed with primary crater ejecta. Ejecta from large craters, and especially basin-forming events, not only excavate preexisting local materials, but also are capable of moving large amounts of material away from the crater. Thus mixing and lateral transport give rise to continuous deposits that contain materials from within and outside the primary crater. As a consequence, ejecta of basins and large highland craters have eroded and mixed highland materials throughout geologic time and deposited them in depressions inside and between older crater structures.
Hoerz Friedrich
Morrison R. H.
Oberbeck Verne R.
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