Prolonged Early Bombardment of the Inner Solar System from Ages of Lunar Samples
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It appears that the Moon, and therefore also Mars and Earth, experienced an extended phase of post-accretionary heavy bombardment spanning ≥500 Ma rather than a single short, sharp spike of basin-forming impacts at 3.9 Ga.
Norman, M. and Nemchin, A. 2012. Prolonged Early Bombardment of the Inner Solar System from Ages of Lunar Samples, in Proceedings of the 75th Annual Meeting of the Meteoritical-Society, Aug 12-17 2012, id 5401. Cairns, Australia: Lunar and Planetary Institute.
METEORITICS & PLANETARY SCIENCE
Department of Applied Geology