In the highlands at 51.3°N, 121.4°W Sarton Y and Z stand out among the other craters. Take a look at this area in the LROC WMS Image Map. Other craters in the region have filled floors, however, Sarton Y and Z are the only two craters to also have floor fractures. Why is this? What makes Sarton Y and Z special? Perhaps the subsequent impact of Sarton Y allowed the material in both craters to undergo a thermal evolution different from their surrounding counterparts, possibly causing the fractures as the floors cooled. Was there a difference in the surface material when Sarton Y and Z were formed? Both craters show evidence of slumping, but so do the other craters in the region. Age or the composition of the impactor may also play a role.
Explore more of the fractures in the NAC frame!
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