The second largest impact basin on Mercury discovered by MESSENGER during its second flyby. Formed 3.9 BYA (young for a large basin). Lava only flowed in the central region, unlike most similar basins. A unique formation of spoked ridges also appears in the basin. The largest fault on the planet runs through this basin. The only basin with its original impact floor exposed which have not been obliterated by subsequent vulcanism.
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