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800km
wide Mariner 10 image showing part of the terrain lying on the far
side of Mercury from the Caloris Basin
(i.e. near the right centre of the incoming
hemispheric view). The terrain was contorted by the converging
seismic waves (from the Caloris impact), and flung up into a chaotic
jumble of hills 5-10 km wide and up to 2 km high. The rims of pre-existing
craters have been disrupted in this manner, but younger craters,
which post-date the Caloris impact, are entirely ordinary in appearance.
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