Image Credit: NASA/JPL/ASU

Context image credit: NASA/JPL/MOLA
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In western Acidalia, two craters of similar size (a few km’s) dramatically display the effects of geologic activity. The younger one on the left has been left relatively well pre- served, retaining a sharp rim crest, a classic bowl shape, and a clearly defined ejecta blanket. The older one on the right likely has experienced a flood of lava that covered over the ejecta and filled in the bowl (note the breach in the rim). Its rim crest has been worn down by a multitude of subsequent impacts.