Last updated on April 17, 2014 at 16:43 EDT
A Tale of Two Craters
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A Tale of Two Craters

October 12, 2009
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.