Mathematics – Logic
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icbg.conf...25g&link_type=abstract
Impact Cratering: Bridging the Gap Between Modeling and Observations, p. 25-26
Mathematics
Logic
Terrestrial Planets, Impact, Cratering, Observation, Diameters, Time Dependence, Stability, Populations, Periodic Variations, Lithology, Ground Truth, Earth Crust
Scientific paper
The currently known terrestrial record of impact cratering stands at over 160 impact structures and several new examples are identified each year. The record, however, is a biased sample of an originally much larger population, favoring younger, larger structures in geologically stable areas of the Earth's continental crust. The largest and oldest known structures are limited to diameters of approx. 250-300 km and ages of less than 2 Ga. Care must be taken, therefore, in making generalised statements regarding the record with respect to such time-integrated effects as variations in cratering rate, periodicities, etc. The terrestrial record, however, does provide cumulative observations of aspects of the cratering process and is the only available source of ground truth with respect to the structural and lithological results of large-scale natural impact events.
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