The Valles is a caldera that formed 1.5-1.1 million years ago as the result of massive eruptions (600 cubic kilometers) from the magma chamber beneath. See below for an aerial photograph (hard to decipher, I know) of the caldera. The roundish feature is the rim of the caldera, and all the flat-looking areas within are meadows. The mountains in the middle of the caldera are the resurgent dome, which the link above talks about.

I've now been here a number of times, and I just can't get over how beautiful it is, especially with a little snow blanket on it. Enjoy some pictures below; hopefully, I'll soon have some more current ones from the upcoming months!
Oh, I have more at home from non-winter. Maybe I'll put some up later.
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