Aerial surveys of the Vredefort impact crater in South Africa suggest that it is only weakly magnetic. The rocks themselves tell a different story, but does this apply to giant impact basins on Mars?
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Dunlop, D. Magnetic impact craters. Nature 435, 156–157 (2005). https://doi.org/10.1038/435156a
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DOI: https://doi.org/10.1038/435156a
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