[glup]

I was vacationing in Mammoth one time and started reading about the geology... quite a shock to find that basically everything to the east is a giant caldera [1]. Also 760,000 years ago is really quite recent on geologic time scales.

[1] https://en.wikipedia.org/wiki/Long_Valley_Caldera

[pitaj]

That's about the same size as the Henry's Fork Caldera [0] which is within the much larger Island Park Caldera [1], both produced by the Yellowstone hot spot. The Island Park Caldera is one of the largest in the world.

[0]: https://en.wikipedia.org/wiki/Henry%27s_Fork_Caldera [1]: https://en.wikipedia.org/wiki/Island_Park_Caldera