Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991geo....19..143r&link_type=abstract
Geology (ISSN 0091-7613), vol. 19, Feb. 1991, p. 143-146. NASA-sponsored research.
Other
24
Moon, Stratigraphy, Age Dating, Argon, Isotopes, Samples, Lunar, Kreep, Apollo 15 Mission, Basalt, Impact Effects, Shock Effects, Autolycus, Laboratory Studies, 15434, Isotopic Ratios, Craters, 15358, Age, Flux
Scientific paper
Ar-39 - Ar-40 analyses of three petrographically distinct, shocked Apollo 15 KREEP (i.e., high K, rare earth element, P, and other trace element contents) basalt samples demonstrate that a major impact event affected all three samples at about 2.1 Ga. The Copernican System craters Aristillus and Autolycus are to the north. Autolycus, the older of the two, is in a particularly appropriate terrain and is the most likely source of the 2.1 Ga heating and delivery event. With this calibration point, and if Autolycus really is a Copernican crater, the Copernican System lasted twice as long as has previously been suggested. Furthermore, the moon was not subjected to a constant cratering rate over the past 3 billion years; the average rate in the preceding Eratosthenian must have been twice that in the Copernican.
Bogard Donald D.
Garrison David
Ryder Graham
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