Mathematics – Logic
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..403g&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Mathematics
Logic
3
Cratering, Earth-Moon System, Impact Damage, Planetary Craters, Planetary Evolution, Erosion, Rates (Per Time), Saskatchewan, Topography, Planets, Cratering, History, Earth-Moon System, Earth Crossers, Size, Apollo 12, Apollo 15, Landing Sites, Diameters, Ages, Topography, Erosion, Anomalies, Geology, Cratons, Tycho, Copernicus, Comparisons, Earth, Moon
Scientific paper
The terrestrial data base for crater structures with diameters over 20 km on the North American and European cratons has been investigated for variations in the rate with time. The variation in the degree of preservation of highly eroded complex structures on the two cratons suggests that, if no contrasts exist between near-surface and uplifted lithologies, a 20 km-sized crater may be rendered virtually unrecognizable in 34 to 300 m.y. If lithological contrasts are present, it may be still recognizable as an anomalous structure for 79 to 630 m.y. It is unlikely that a significant number of craters with diameters greater than 20 km and ages in the range 0-117 m.y. are unrecognizable because of erosion. The relatively slower rate of increase in the number of craters with time for the 180-360 m.y. population may reflect a recognition problem.
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